The results from the world’s largest sleep study have shown that people who sleep on average between 7 to 8 hours per night perform better cognitively (认知地) than those who sleep less or more than this amount.
The world’s largest sleep study was launched in June 2018 and within days more than 40,000 people from the world participated in the online scientific investigation, which included an in-depth questionnaire and a series of cognitive performance activities.
“We really wanted to capture the sleeping habits of people around the entire globe. Obviously, there have been many smaller sleep studies of people in laboratories but we wanted to find out what sleep is like in the real world,” says Adrian Owen, western’s researcher in Cognitive Neuroscience and Imaging. “People who logged in gave us a lot of information about themselves. We had a fairly extensive questionnaire and they told us things like which medications they were on, where they were in the world and what kind of education they’d received because these are all factors that might have contributed to some of the results.”
More than half of all participants reported typically sleeping less than 6.3 hours per night, about an hour less than the study’s recommended amount. One shocking truth was that most participants who slept four hours or less performed as if they were almost nine years older.
Another surprising discovery was that sleep affected all adults equally. The amount of sleep associated with highly functional cognitive behavior was the same for everyone, regardless of age. Also, the harm associated with too little, or too much sleep did not depend on the age of the participants.
“We found that the best amount of sleep to keep your brain performing its best is 7 to 8 hours every night. We also found that people that slept more than that amount were equally harmed as those who slept too little,” says Conor Wild, Owen Lab Research Associate and the study’s lead author.
1.Where did the study take place?
A. In a lab. B. In the street.
C. On TV. D. On the Internet.
2.What may affect the result of the study according to Owen?
A. Career. B. Diet.
C. Education. D. Exercise.
3.What’s Wild’s view?
A. Sleeping too much is as bad as sleeping too little.
B. People must sleep for eight hours every night.
C. Sleeping too little can make people look older.
D. People needn’t pay attention to the amount of sleep.
4.What can we learn from the text?
A. Owen and Wild are the first to study sleep.
B. Lack of enough sleep is a common problem.
C. All the people in the world show interest in the study.
D. There is no effective way to solve the sleep problem.
About 150 million years ago, in Montana, a young dinosaur roamed through a land. Not yet five years old, the long-necked creature somehow ended up buried in a violent and muddy flood, forever freezing it in adolescence.
Now, researchers have found this potentially record-setting dinosaur. After uncovering the remains, the scientists argue that the skull (烦骨) is the smallest yet found from a group of long-necked dinosaurs called Diplodocus (梁龙). The little fellow even has a nickname ： Andrew, after Andrew Carnegie, who funded the research, and there is a Diplodocus species named after him.
With its skull just 10 inches across , researchers’ best guess is that Andrew was a juvenile Diplodocus—an especially rare find. While more than a hundred Diplodocus samples have been discovered, their skulls are much rarer. Fewer than a dozen have been dug up to date. If the researchers’ reconstruction is correct, Andrew’s skull could be the smallest and least mature Diplodocus skull ever found, potentially providing insights into the dinosaur’s development.
Kristi Curry Rogers, a paleontologist at Macalester College in Minnesota doesn’t fully agree with the findings because of the poor preservation of the fossil (化石). Andrew’s skull is missing parts of the cheek, palate and lower jaw, plus the fossils are slightly pressed. These problems make it hard to reconstruct the skull, let alone infer the dinosaur’s behavior from it.
“The researchers don’t address the damage of the skull or the missing components of the face in any great detail, which could easily change the explanations,” she said in an email.
For now, Diplodocus is the best guess for Andrew’s identity, but it could also be an unknown species. To help settle the debate, Andrew’s skull is currently being 3-D scanned for future research.
1.What did the researchers discover?
A. The youngest Diplodocus. B. The biggest dinosaur skull.
C. A rare dinosaur fossil. D. A species of Diplodocuses.
2.The underlined word “juvenile” in paragraph 3 is closest in meaning to “_________”.
A. young B. strong
C. ancient D. dead
3.Why does Rogers disagree with the researchers’ guess?
A. The researchers have lost some parts of the fossil.
B. The guess of the fossil lacks enough evidence.
C. She couldn’t understand the researchers’ explanations.
D. She has his own opinions about the dinosaur’s development.
Michelle Kwan is a champion ice skater who has won five World Championships, nine U. S. Championships and two Olympic medals, in addition to countless other skating competitions. While audiences have seen her glide effortlessly across the ice, long hours of practice and devotion contribute each jump and spin.
Kwan began ice skating when she was five years old, and her skill quickly became evident. At the age of eight, she skated several hours a day, every day of the week. Before school, after school and on weekends, she was at the ice rink. The cost of ice time and coaches quickly grew, but her parents were committed to her success. Her family sold their home and purchased a much smaller one to free up money to pay for her ice skating.
When Kwan was 13, she performed at her first U. S. National Championships. After a disappointing performance, she swore to work even harder and improve. She did. The next year, she finished second. From there she went on to win a silver medal at the 1998 Olympics and the first of her World Championships. She followed up with a bronze medal at the 2002 Olympic Games.
Kwan is the most decorated figure skater in American history. She was the sole member to the U. S. Figure Skating Hall of Fame and the World Figure Skating Hall of Fame classes of 2012, and in 2014, she was appointed to the Hall of Fame at the U. S. National Competition.
Even after retiring from skating. Kwan has not given up her devotion to learning, service and hard work. She received her college degree in 2009 from the University of Denver and is pursuing graduate studies in international relations at Tufts University. Meanwhile, she has held several diplomatic and ambassador positions representing the United States globally. Ultimately，whether on the ice, in the classroom or representing her nation, Kwan presents one consistent quality—devotion.
1.What do we know about Kwan according to the text?
A. She performed badly in her first national competition.
B. She has won five U. S. Championships.
C. She failed to graduate from Tufts University.
D. She hasn’t won the second place in Olympic Games.
2.Which of the following can best describe Kwan?
A. Warm-hearted. B. Energetic.
C. Easygoing. D. Devoted.
3.What may be the best title for the text?
A. The Way to Success B. A Great Skater
C. How to Be a Good Player? D. Why Is Devotion Important?
假设你是李华，你的美国朋友Jonah得知你即将到美国旅游。他来信询问你是否方便带点中国特产给他，请你根据以下要点给他写一封回信。
1. 表示愿意；
2. 介绍特产（茶叶、丝绸等）；
3. 询问要求（种类、数量、预算等）。
注意：1. 词数100左右；
2. 可以适当增加细节，以使行文连贯；
3. 开头和结尾已为你写好， 但不计入总词数。
参考词汇：特产local special products
Dear Jonah,
I’m glad to know you are interested in Chinese local special
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Looking forward to meeting you in the USA.
Yours,
Li Hua
下面短文中有10处语言错误。请在有错误的地方增加、删减或修改某个单词。
增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。
删除：把多余的词用斜线（/）划掉。
修改：在错的词下划一横线，并在该词下面写上修改后的词。
注意：1.每处错误及其修改均仅限一词；
2.只允许修改10处，多者（从第11处起）不计分。
As the saying goes, “Chance favored the prepared mind.” I learned this from one of my experience.
I was not chosen as member of the volleyball team of our school. Because of this, I decided to give up play volleyball. Luckily, my best friend stopped me but pointed out that it was my laziness and poor preparation which led to my failure. After that, I practiced playing volleyball on every day. When another tryout arrived, I was full prepared and tried my best. As a result, I was selected and became an important player on our school team.
From this, I am firmly convincing that we are able to seize a chance as long as I get well prepared.
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。
China has once again showed its ability to change the world with its “new four great 1. (invent)”—high-speed rail, electronic payment, shared bicycle, and online shopping.
China’s new-generation high-speed train, the Fuxing, is now one of the 2. (fast) trains in the world, which can travel at a speed of 350 km/h. Besides high-speed rail, China 3. (improve) people’s lives in many other innovative (创新的) ways over the last decade.
Bike sharing, for example, is not new itself. But China has made 4. much more convenient and popular both in China 5. overseas. Leading Chinese bike-sharing companies Mobike and Ofo are now operating in foreign countries such as Singapore and Britain.
And back in China, when riding a shared bike, you can stop 6. (buy) and eat whatever you want 7. (simple) with a tap of your phone. You could easily pay with your smartphone by 8. (scan) the seller’s QR code. Cashless payment has grown into a 9. (choose)for Chinese people—even a pancake seller is using Alipay.
Besides, the four innovative ways of life are most appealing 10. youths from 20 countries participating in the Belt and Road innovation, and they wish their countries would emulate(仿效) China in terms of technological achievement
