阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Senior citizens are the first to come to our mind when you think of hearing loss, but in a recent report, hearing professionals worry teenagers will soon outnumber aging adults 1. it comes to living with hearing loss.
The rise in popularity of personal audio devices from iPods to smart phones has had dangerous effect on the ears of those who use them most, teenagers! A research 2. (conduct) by the World Health Organization finds that nearly 50% of teens 3. (fall) into the habit of exposing themselves to unsafe levels of sound so far.
A sound is considered unsafe when it goes beyond 85 decibels (分贝). At that level, it takes just 8 hours of listening over your lifetime to cause damage. The louder the sound is, the 4. (little) time it takes to cause damage. Because hearing loss is 5. (typical) considered a health problem for the elderly, it is difficult to convince already stubborn teenagers that they really are doing damage 6. their ears.
Young adults 7. have been exposed to loud noise over a period of time may have some hearing loss symptoms. Their 8. (able) to learn is compromised, and they may have difficulty developing social skills.
In an effort to help teens better protect their hearing, we suggest 9. (set) volume limits on personal audio devices. 10. is also good to limit the amount of time exposed to noise and to take listening breaks to give the ears a rest.
I stood in the front of the classroom like a specimen(标本） under examinations of 23 pairs of eyes. I began stuttering(结巴）and gave wrong answers to some questions.
In the summer of 2016, I worked as an assistant teacher at a children's day camp.Lacking in experience，I _______ to create weekly lesson plans.Kids shouted at each other in class.Sometimes，I had to pull apart kids who were _______ each other.The rare moments of_______ came only after my booming calls for attention. Every day was a _______ between me and these wild little creatures.
One day I suddenly _______ that I was supposed to teach them instead of being led by the nose. It was time to do something to change the _______. I was older, more knowledgeable, and most _______, I had more authority. The next day，I firmly_______into the classroom and stood in the front_______.The students studied me curiously. But I did not stutter this time. It________ me that the class went smoothly without being ________ for the first time. From that day on，they gradually started to pay attention. Some ________started calling me “Ms. Amy”. Seeing a sign of respect in their wild eyes was like getting ________ for my achievements. I was finally acting as an authority figure. The ________ I received also increased my self一confidence. It made me believe that I had the________. to overcome difficulties.
One month after my summer job ________, I went back to visit the students. I saw the ________ kids running around in the classroom. ________，their playful shouts were a different kind of music to my ________now. Instead of the unpleasant sound I heard the first day，this was a________ song that played during my march to self—confidence.
1.A.refused B.failed C.struggled D.hesitated
2.A.calling on B.fighting with C.staring at D.learning from
3.A.patience B.promise C.thought D.silence
4.A.battle B.difference C.link D.joke
5.A.hoped B.realized C.regretted D.remembered
6.A.suggestion B.occasion C.situation D.decision
7.A.importantly B.interestingly C.naturally D.hopefully
8.A.burst B.slipped C.rushed D.stepped
9.A.anxiously B.cautiously C.eagerly D.calmly
10.A.surprised B.embarrassed C.disappointed D.amused
11.A.puzzled B.encouraged C.disturbed D.observed
12.A.just B.even C.ever D.still
13.A.recognition B.information C.evaluation D.discussion
14.A.trust B.sympathy C.pride D.respect
15.A.chance B.right C.ability D.intention
16.A.continued B.ended C.started D.returned
17.A.same B.special C.poor D.normal
18.A.Therefore B.However C.Besides D.Otherwise
19.A.heart B.eyes C.ears D.soul
20.A.popular B.complex C.strange D.unique
Questions to Ask Before Getting Your Child a Cellphone
At what age should you get your child a cellphone? 1. However, before you decide to add your child to your family plan, ask yourself these questions.
2.
If you and your child are not often apart beyond school hours, a cellphone may not be a serious necessity, but if he is independent or involved in extracurricular (课外的) activities outside your home, a cellphone could be useful, especially during emergencies as a convenient means of communication with you.
Does your child understand the cost?
Make sure your child understands the cost of having a cellphone. 3.Some options to help control costs include prepaid and postpaid phones, setting a monthly budget for your child.
How can you keep your child’s phone usage safe and under control?
Before you get your child a phone, you should discuss what it can be used for, rules he is expected to follow and consequences if he fails to follow them. 4.
5. If you prefer to take an extra step towards monitoring his phone use, these application programs to allow you to track your child’s mobile activity.
A.Who needs a cellphone?
B.You ask your child to make use of his cellphone for learning.
C.Also, educate yourself on what social media apps are popular with teens.
D.According to Pew Research Center, the average age is between 12 and 13.
E.How can you determine whether or not to buy a cellphone for your child?
F.Also be sure that he can be trusted to stay within his limits from month to month.
G.For example, is the phone only to be used to call family, or can it be used socially?
Dutch officials toasted on Tuesday the opening of what is being called the world’s first 3D-printed concrete bridge, which is meant to be used by cyclists. There was applause as officials wearing hard hats and workmen’s jackets rode over the bridge on their bikes at the opening ceremony in the southeastern town of Gemert.
“The bridge is not very big, but it was rolled out by a printer which makes it unique,” Theo Salet, from the Eindhoven University of Technology, told Dutch broadcaster NOS. Work on printing the bridge, which has some 800 layers, took about three months after starting in June and it is made of pre-stressed concrete, according to the university. “One of the advantages of printing a bridge is that much less concrete is needed than in the conventional technique in which a mould (泥浆) is filled,” it said on its website, adding “a printer deposits the concrete only where it is needed.”
The eight-metre (26-foot) bridge crosses a water-filled channel to connect two roads, and it was tested for safety to bear loads of up to two metric tons in cooperation with the BAM Infra Construction company. Although designed for bikes, it could take up to 40 trucks, the designers said “We are looking to the future,” said the head of BAM, Marinus Schimmel. “3D printing meant fewer rare resources were needed and there was significantly less waste,” he added.
The Netherlands is among countries, with the United States and China, taking a lead in the cutting-edge technology of 3D printing, using computers and robotics to construct objects and structures from scratch without using much traditional manpower. Last year a Dutch architect unveiled (提示) a unique 3D printer with which he hopes to construct an “endless loop” building. And a Dutch start-up called MX3D has begun printing a stainless-steel bridge, of which a third is already completed. The aim is to finish printing by March and lay the bridge over an Amsterdam canal in the future.
1.According to the text what makes the bridge unique?
A. It adopts 3D printing
B. It opens only to cyclists.
C. It is made of new material.
D. It uses much less concrete.
2.According to Marinus Schimmel. the bridge ________.
A. fails to bear heavy loads more safely
B. needs no concrete and mould
C. is designed for bikes and trucks
D. is cost-efficient and eco-friendly
3.According to the last paragraph, which of the following statement is true?
A. The 3D-printed bridges are all designed for bikes.
B. 3D-printed construction saves much human labor.
C. United States and China develop slowly in 3D printing.
D. The stainless-steel bridge by MX3D has been put into use.
4.What is the best title for the text?
A. The Value of the 3D Printing Technology
B. The Netherlands Leads the Way in 3D Printing
C. World’s First 3D-printed Bridge Opens to Cyclists
D. 3D Printing is Widely Used in Building Bridges
Breathing dirty air comes at a high price. Air pollution lowers the average life spans (寿命) by a year worldwide and in more polluted parts of Asia and Africa, dirty air shortens lives up to twice that much. Scientists shared their new findings in Environmental Science & Technology Letters. The study used data gathered in 2016 as part of a project known as the Global Burden of Disease and was the first major country-by-country look at the connection between the length of life and what’s known as fine PM.
Air pollution has been linked to many health problems. Most earlier studies had looked at how tiny air pollutants affected rates of illness or death. Joshua Apte is an environmental scientist at the University of Texas at Austin. By looking at life expectancy (预期寿命), his team had hoped to make the threat easier to understand. PM2.5 is what scientists call tiny particles (颗粒) of pollution in the air. Higher levels of PM2.5 can cause health problems and cut months, if not years, from the average length of life. This analysis shows how pollution affects life expectancy in different parts of the world.
The World Health Organization (WHO) recommends limiting PM2.5 to 10 micrograms per cubic meter of air. Apte’s group calculated how holding pollution to this low level would help people. In countries with very dirty air, meeting this standard would lengthen people’s lives. However, in countries whose air already meets this standard, the study shows no gain in life expectancy. In other words, meeting the WHO standard won’t reduce health costs resulting from dirty air because even below 10 micrograms per cubic meter, pollution still causes serious risks. Meanwhile, the scientists compared how other threats including smoking and cancer shorten the length of life across the globe.
1.What is special about the study?
A.It won recognition from a professional journal.
B.It discussed health problems caused by air pollution.
C.It gathered lots of data for the Global Burden of Disease.
D.It analyzed the link between life spans and PM by country.
2.What is Joshua Apte’s team trying to do?
A.Help people better understand air pollution.
B.Study life expectancy in different countries.
C.Know how small air pollutants affect health.
D.Deal with different kinds of health problems.
3.What will happen if a country limits PM2.5 to 10 micrograms per cubic meter of air?
A.People’s life spans will surely increase. B.It will get strong support from the WHO.
C.People’s health may not be much improved. D.It will guarantee people clean air.
4.What might be discussed in the following paragraphs?
A.How cleaning up the air can lengthen lives.
B.How air pollution shortens lives by country.
C.How other threats shorten life expectancy.
D.How all the countries deal with severe pollution.
William Lindesay has been interested in the Great Wall of China since seeing it in a school atlas（地图册）as a child in England. I vividly recall seeing in the " Oxford School Atlas" the Great Wall with its battlement symbol. From that moment, I had in my mind that when I grew up I'd go to China and walk along the Great Wall from end to end.
Lindesay's about 3 ,000-km solo run along the Great Wall began in 1987. Running the length of the wall was a brave expedition, venturing into sparsely populated regions where there was little chance of help if the runner had an accident. During another trip, Lindesay and his team ventured deep into the Gobi Desert of Mongolia. The explorers almost died from dehydration(脱水） . In total, Lindesay estimates in an interview that he has spent about 1,600 days of his life, or four full years, on the Great Wall in all seasons.
Lindesay and his wife, Wu Qi, whom he got to know and fell in love with during his trips in China, had a farmhouse at the foot of the wall. During his exploration, he noticed some sections of the wall were badly damaged and covered with litter. Modernization and development were making the situation even worse. "Some people say it will take generations to change; I say we don't have generations of time. It's got to be much quicker, " he said. Lindesay always carries a garbage bag with him in the wilderness, picking litter along the way. Lindesay uses a garbage bag as his calling card. The cloth bag bears a set of nine simple guidelines in Chinese, which calls on people to observe while traveling or camping outdoors : "Take your own garbage home" "Pick up? litter left by othersDon't damage plants or flowers, or pick fruit" and lots more.
1.What sparked William Lindesay's dream of exploring the Great Wall?
A.Seeing a movie about the Great Wall.
B.Experiencing a war for the Great Wall.
C.Surfing a website about the Great Wall.
D.Admiring the Great Wall in the school atlas.
2.What does the underlined word "sparsely" mean?
A.Remotely. B.Rarely.
C.Frequently. D.Largely.
3.What worsened the situation of the Great Wall?
A.The destroyed ecosystems. B.Waste caused by farms.
C.The increasing tourists. D.Modernization and development.
4.What sort of man was William Lindesay?
A.Strong - willed and selfless. B.Determined and grateful.
C.Warmhearted and impolite. D.Considerate and optimistic.
