Wake up, boys and girls! Put up your hand if you try to repair your tired body by sleeping in(睡懒觉)on weekends. A new study says the habit might not be a good idea for your health.
The ten-day study came out in the magazine Current Biology. Volunteers were divided into three groups. The first group enjoyed nine hours' sleep each night. The second group was allowed to sleep only five hours each night. The third group was given five hours' sleep Monday through Friday.1.But they were put back on the short sleep schedule the next Monday.
Both the second and third groups ate more snacks at night and put on weight. They also saw a decrease (减少) in insulin sensitivity (胰岛素敏感性), a warning sign for diabetes (糖尿病). Researchers have long known a tack (缺乏) of sleep can increase health risks.2.
"Even though people in the third group slept as much as they could on the weekend, it was not enough," said Dr Kenneth Wright, who led the study. "When they went back to the short sleep schedule the next week, their body failed to control blood sugar. 3.
So what should we do if sleeping in over the weekend is not a good choice? 4. Cut out the "sleep stealers" such as watching television shows or spending time on computers or mobile phones. Always remember. Getting enough sleep is as important as having good caring habits or doing exercise regularly.
A.That was partly because their biological clock (生物钟) had been changed.
B.People can repair their tired body by sleeping in on weekends.
C.But it was surprising that the third group had been worse than the second one.
D.Dr Wright gave advice in two words: sleep longer.
E.And then they were allowed to sleep as much as they liked over a weekend.
The longest river in the world is the Nile. It is 4,160 miles long. But the Nile is not the mightiest (浩荡的) river. The Amazon is. The Amazon is also the second longest river in the world. It is 3,900 miles long. How long is that? It is longer than a road going from New York City to San Francisco.
The Amazon is the mightiest for this reason. It has the greatest amount of water. More water runs out to sea than from the Nile. Mississippi, and Yangtze rivers combined. That's a lot of fresh water! The force of its current (水流) is great too. The current can be seen 200 miles out in the sea. There's a story to show the Amazon's amazing current. A ship sailed (航行) far away from Brazil. It ran out of drinking water. Another ship passed by. The first ship asked for water. Someone on the second ship said. "Just put your buckets (桶) into the sea."
Here are a few more facts. At its mouth, the Amazon is 90 miles wide. Even up the river, you can't see the opposite bank. The river is also very deep(from 22 to 76 meters). During rainy season, the river rises about 16 meters more. Big ocean ships can sail about 1,800 miles upstream (向上游). Smaller ships can sail 1,000 miles farther.
What's the most bloodthirsty fish in the world? No. It's not the shark. It's the Amazon's piranha. It is only about 10 cm to 20 cm long. It has sharp teeth. Thousands travel in a group. No animal can swim across the rivet. A 1,000-pound horse would be just bones (骨头) in three minutes. Are you planning a trip to the Amazon? Here's a piece of advice. Leave your swimsuit at home!
根据短文内容，选择最佳答案。
1.After reading this passage it seems clear that____________.
A.people do not drink the Amazon’s water
B.it would not be good to visit the Amazon during rainy season
C.sailing on the Amazon requires knowledge of its current
2.The writer helps you understand how long the Amazon is by___________.
A.telling how long the Nile is B.comparing it to a distance(距离)on land
C.comparing it with the Yangtze River
3.In Paragraph Four, the word“sharp”means“_________”in Chinese.
A.锋利的 B.急剧的 C.强烈的
4.The passage mainly tells us____________.
A.piranha in the Amazon B.traveling in the Amazon C.interesting facts about the Amazon
Wearing a white blouse, Ai-Da studies her subject and begins to draw. She looks like any artist at work. However, the "beep ... beep ... beep" noise from her arm gives her away. Ai-Da is, in fact, a robot.
Ai-Da has been described as the world's "first AI (人工智能) robot artist". She takes her name from Ada Lovelace, the world's first female computer programmer. Scientists at Oxford University developed AI systems (系统) for Ai-Da. The robot has cameras in her eyeballs. After she has studied a subject, she will use her left arm to draw. Now, Ai-Da can only use a pencil for sketches (素描). The plan is for her to paint.
Ai-Da is not the first AI system to produce artworks. Since 2006, scientists have been developing software (软件) to turn photos into drawings. Last year, an artwork created using AI was sold in New York for $132,500. However, Ai-Da's human-like appearance brings something new to the field.
In June, Ai-Da opened her first exhibition at Oxford. There were about 30 drawings by the robot. Ai-Da, standing next to her artworks, attracted (吸引) many visitors.
Ai-Da's inventor, Aidan Meller, talked about the importance of the robot. "Ai-Da brings a new voice to the art world," she said. "AI is going to be the big thing of the 2020s. That influences us greatly." Meller hopes the exhibition was just the start and that more will follow to show how AI is influencing human life.
根据短文内容，判断下列句子正误。正确的用“A”表示，不正确的用“B”表示。
1.Ai-Da is a real artist who helps scientists at Oxford University develop AI systems.
2.Last year, scientists began to develop software to turn photos into drawings.
3.In June, Ai-Da opened her first exhibition at Oxford successfully.
4.Aidan Meller thinks AI is going to influence human life more and more greatly.
In America, Thanksgiving is a holiday_____________celebrates the love of family.
A.who B./ C.that
We have to ______________ the school trip because of the bad weather.
A.put off B.get off C.turn off
___________do people greet visitors? Some shake hands. Some say "hello" or "hi". Some kiss.
A.Why B.What C.How
