In March 2017, about 25 people 1.（invite）to a kitchen in San Francisco, California, for a tasting event. On the menu? Fried chicken grown in a lab by scientists from Memphis Meats.
The company makes meat by 2.（safe）extracting（提取）cells from animals such as chickens, ducks, and cows. Then 3. feeds the cells nutrients（营养物）.Those cells grow, 4.（form）muscles, which are meat. Memphis Meats is one of several companies in the world making lab-grown meat. Why do they produce lab-grown meat?
Producing meat with 5.（tradition）methods requires lots of cows. And cows give off a gas that traps heat in the atmosphere, which contributes 6. climate change. Raising cows takes up space, too. But lab- grown meat production requires fewer cows and less land. The cells taken during one extraction can make 7.（much）meat than "any single animal could ever produce”.
Lab-grown meat is not yet sold in supermarkets. Before that can happen, it will need to be affordable. The 8. （one）lab-grown burger, 9.（produce）in 2013 by Mosa Meat, cost over $300,000 to make. Costs are dipping. But they can't yet compete with regular ground beef, 10. is about $4 a pound.
Deep in the forest, my husband and I had fun walking up a snow-covered hill. However, our lightheartedness _______ when we came out into a clearing and saw a parking lot without our car in it. As I looked around, nothing looked _______ I realized we were lost. It was frighteningly _______ except for our footsteps hitting the pavement and my heavy breathing. My husband suggested we conserve energy by walking slower and that we eat the snow on the ground _______ we needed water. For the first time in my life, I was _______ to be a hitchhiker（搭便车者）, but we didn't meet a single car on the road.
_______, my husband spotted a small structure on a hill in the distance. As we _______, we saw a sign: Administration Building. After opening the unlocked door, we saw a map of the forest on the wall. I was reading it when a friendly woman appeared. I could hardly _______ my excitement. She offered us a ride back to our _______. When we entered the correct parking lot, it was a great ________ to see our car again. I had my husband take a photo, of this woman and me. Despite our physical ________, we felt joyous.
Two days later, something ________ happened. We returned to the city for one last ________ to the lighthouses before leaving for the airport. I heard beeping when we ________the car. Confused, I ________and saw a hand waving from a（n） ________ car nearby. The window went down, and a voice called out, “I just stop to say hello. "
It was the same woman who had ________ us from the Administration Building back to our car, now two and a half hours' drive from our ________ meeting place.
We met that lovely woman on two separate days in two different places. What a ________! We've been ________ for more than eleven years now. Our picture hangs in her work area, and we e-mail every Christmas season.
1.A.worsened B.remained C.accumulated D.disappeared
2.A.special B.familiar C.plain D.attractive
3.A.empty B.open C.quiet D.clean
4.A.in case B.as though C.so that D.even if
5.A.likely B.afraid C.bound D.willing
6.A.Suddenly B.Strangely C.Cautiously D.Instantly
7.A.attempted B.quit C.approached D.withdrew
8.A.take back B.hold back C.hold out D.take out
9.A.home B.airport C.city D.car
10.A.relief B.trial C.honor D.wonder
11.A.comfort B.tension C.illness D.tiredness
12.A.absurd B.amazing C.terrible D.unreasonable
13.A.reference B.invitation C.visit D.answer
14.A.deserted B.exited C.remembered D.discovered
15.A.looked around B.looked inside C.looked ahead D.looked down
16.A.abandoned B.used C.stopped D.disabled
17.A.driven B.tracked C.attracted D.followed
18.A.terminal B.unusual C.frequent D.original
19.A.contribution. B.coincidence C.commitment D.convenience
20.A.relatives B.neighbors C.friends D.colleagues
It's free and requires no equipment. Besides, the scenery can be amazing. It's no wonder running is among the world’ s most popular sports. Research suggests running can significantly improve your health. 1.
Running just once a week, or 50 minutes a week, reduces the risk of death at a given point in time. 2. This is good news for those who don't have much time on their hands for exercise. But it shouldn't discourage those who enjoy running longer and more often. We found even "hardcore" running (for example, every day or four hours a week) is beneficial for health. Nor do the benefits necessarily increase by running at high speeds. We found similar benefits for running at any speed between 8 and 13 km/h. It might be that running at your own "most comfortable pace" is the best for your health.
3. Running may lead to overuse injuries. These occur as a consequence of repeated mechanical stress on the tissue without enough time for recovery. Sudden death is also likely to happen during exercise, though, this occurs very rarely.
Therefore, for beginning runners, start slow and gradually increase the pace, duration and weekly frequency. Set your aim at 50 minutes a week or more, and run at a comfortable speed.
If you don't like running alone, consider doing it along with others. 4. It can be hard to start running, but it shouldn't be too hard. 5. There are more than 800 other interesting sports to choose from. The benefits of many other sports (such as swimming, tennis, cycling and aerobics) are comparable to the ones found for running.
A.If you don't like running, don't force it.
B.However, keep it in mind that there are risks as well.
C.It also indicates you needn't run fast or far to gain the benefit.
D.It can increase your motivation and provide a fun social experience.
E.Running may help you live longer but more isn't necessarily better.
F.The benefit doesn't seem to increase or decrease with higher amounts of running.
G.Doing it in many sessions spread across the week brings much more benefits.
Australian consumers in Adelaide are taking part in a study to help realize the potential for edible（可食用的）insects as a food industry. Consumers' attitudes are being put to the test at Adelaide Central Market with an offering of roasted crickets and ants, mealworm cookies and cricket energy bars.
Researchers want to further probe consumers' attitudes towards edible insects, and evaluate taste preferences and consumers5 willingness to buy such products. In an earlier online survey of 820 Australian consumers, the researchers found that 20% had tried edible insects. Of those surveyed, 46% said they'd be willing to try a cookie made from insect flour.
" In the earlier survey, consumers said they were most likely to try flavored or roasted insects and least likely to want to try cockroaches or spiders," Dr Crump says. "In this taste test, we've chosen products that consumers are most likely to react positively towards―apologies to anyone keen to try a cockroach or spider. The samples we'll be offering consumers provide a good spread of the available insect products in Australia' s marketplaces, some of which may be more acceptable than others."
Dr Crump says the research will help guide the development of an edible insect industry. In Australia, edible insects remain a new agricultural industry. Consumer research is needed to improve consumer acceptance of edible insects, so as to realize their potential as an alternative protein（蛋白质）source.
Professor Kerry Wilkinson says edible insects could play a role in global food security. "Problems such as climate change, increasing global population, shortage of agricultural land and rapidly changing consumer preferences are common, particularly in developing countries where there is an increasing demand for high quality animal protein," he says. "These food security problems will only be overcome by a change in food consumption habits. Edible insects could provide one solution. We want to look at ways of overcoming barriers to insect consumption in Australia.
1.What does the underlined word "probe" in paragraph 2 most probably mean?
A.Explore. B.Influence. C.Describe. D.Compare.
2.Why have the researchers chosen certain insect products for the taste test?
A.Because they are richer in protein than other insects.
B.Because it is not difficult to flavor or roast them.
C.Because they are widely acceptable in Australia.
D.Because they are probably to consumers' taste.
3.In Kerry Wilkinson's opinion, how can consumers help remove food security problems?
A.By taking in less animal protein.
B.By changing their eating habits.
C.By expanding agricultural land.
D.By controlling their appetite.
4.What can be the best title for the text?
A.Insects Make Food Security No Longer a Problem
B.Could Edible Insects Help Global Food Security?
C.Edible Insects Prove an Alternative Protein Source
D.What Counts Most When It Gomes to Edible Insects?
A group of scientists trained dogs to detect(发现)a crop disease called citrus greening. The disease has affected orange, lemon and grapefruit trees in the American states of Florida, California and Texas. The dogs can detect the disease weeks to years before it appears on tree leaves and roots, the researchers report. Using dogs is also faster, less costly and more exact than having people collect hundreds of leaves for lab analysis.
Timothy Gottwald is a researcher in the study. He said, “This technology is thousands of years old — the dog's nose. We’ve just trained dogs to hunt new prey：the bacteria that cause a very damaging crop disease.”
Citrus greening is caused by a kind of bacteria that are spread by a tiny insect that feeds on the leaves and stems of citrus trees. Once a tree is infected(感染)，there is' no cure. The disease has also hurt citrus crops in Central and South America and Asia. In one experiment involving grapefruit trees in Texas, trained dogs were correct 95 percent of the time in telling the difference between newly infected trees and healthy ones. “The earlier you detect the disease, the better chance you have at stopping healthy trees being infected by removing infected ones,” Gottwald said.
Professor Matteo Garbelotto says the new research shows that dogs can detect an infection well before present methods. He has been involved in similar research but had no part in the new study.
Laura Sims is a plant scientist. She praised the steps taken to find out if the dogs were detecting the bacteria itself or a plant's reaction to an infection. To do that, the researchers infected different kinds of unrelated plants with the bacteria in a laboratory. The dogs were still able to pick out the infected plants.
Gottwald said, "You've seen dogs working in airports, detecting drugs and explosives. Maybe soon you will see them working on more farms."
1.What does the text say about citrus greening?
A.It mainly damages tree branches.
B.It' s impossible to detect at an early stage.
C.Dogs can better detect it than humans.
D.Humans have to analyze tree roots to detect it.
2.How does a dog detect citrus greening?
A.By tasting. B.By touching.
C.By observing. D.By Sniffing.
3.Early detection of citrus greening enables farmers to ______.
A.help infected trees to recover B.keep it from spreading further
C.improve the quality of fruit. D.better protect infected trees
4.Which of the following statements reflects Gottwald's opinion?
A.Dogs will take the place of humans to conduct risky jobs.
B.Trained dogs make no mistakes in citrus greening detection.
C.Dogs use plants' reaction to an infection to help with their detection.
D.Using dogs for citrus greening detection will be more widespread.
Walter Osipoff was an experienced parachutist（伞兵）.He had already made more than 20 jumps by May 15 , 1941. That morning, Osipoff trained his soldiers to practice jumps. Three boxes, containing weapons, were also to be parachuted overboard as part of the exercise.
Most of the soldiers had already jumped when Osipoff, standing a few inches from the plane's door, started to push out the last box. Somehow his parachute was suddenly opened. Instead of flowing free, Osipoff’s parachute now wrapped itself around the plane's tail wheel. He was now hanging below the tail of the plane. The soldiers struggled to pull Osipoff to safety, but they could not reach him. The plane was starting to run low on fuel, but an emergency landing with Osipoff dragging behind would certainly kill him. And pilots had no radio contact with the ground. To attract attention below, they eased the transport plane down to 300 feet and started circling the airport.
Meanwhile, Bill Lowrey and John McCants saw the trouble at the same time. As the plane circled once again, Lowrey yelled to McCants, “We must save him!” Lowrey's plane took off quickly. Within minutes, they made five approaches, but the air proved too bumpy（颠簸）to try for a rescue. Lowrey flew back once again and edged the plane closer. McCants, standing upright in the back, reached for Osipoff. He grabbed him at the waist and pulled Osipoff into the plane. Lowrey then nosed his plane inch by inch closer to the transport and used his propeller（螺旋桨）to cut the parachute lines. After hanging for 33 minutes between life and death, Osipoff was finally free.
Three weeks later, Lowrey and McCants were awarded for accomplishing “one of the most brilliant and daring rescues in history". Osipoff spent the next six months in hospital. The following January, he went back to parachute jumping.
1.What happened to Walter Osipoff on May 15,1941 ?
A.He was trapped in a skydiving incident.
B.He threw weapon containers by mistake.
C.His soldiers refused to practice parachuting.
D.His parachute failed because of his carelessness.
2.Why did the transport plane circle the airport?
A.To inform the ground crew to refuel for it.
B.To warn other planes to keep away from it.
C.To show the dangerous situation to the ground.
D.To tell the ground to receive weapon containers.
3.How did Lowrey and McCants perform the rescue?
A.They pushed Osipoff back into the plane.
B.They boarded the transport plane to help.
C.They flew under Osipoff* s plane to free him.
D.They guided the transport plane to land safely.
4.What did people think of Lowrey and McCants' behavior?
A.Fearless. B.Subjective. C.Confidential. D.Tentative.
