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In today’s world, sleep experts often say that for a better night’s rest, Americans should turn o1. their smart phones or iPads before sleeping. Such electronic products make the brain more 2.(act), and then influence their sleep. But according to a latest survey, more than 90% of Americans often use a computer or some other 3.(kind) of electronic products in the hour before bed.
Researchers find that man-made light from some electronic products at night may reduce the brain chemicals that help to s4.. In the study, the researchers let volunteers read, play games and watch movies on a screen for different time while measuring(测量) 5. much light their eyes received. They found that two hours of 6.(sit) before a bright screen at night reduced the sleep chemical levels by about 22%.
Then the researchers studied the college students who often 7.(use) computers at night. They got the s8. results. And researchers say that may not only cause sleeplessness, but 9. raise the risk of obesity（肥胖症）, diabetes（糖尿病）and other diseases.
To be on the safe side, the researchers suggest that we should use computer 10.(little) than before, or turn down our screens as much as possible before sleeping.
九年级英语语法填空中等难度题查看答案及解析
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In today's world, sleep experts say that for a better night's rest, Americans should turn off their smartphones or iPads before sleeping. Such electronic products make the brain more active, and then influence people's sleep. But according to a latest survey, more than 90% of Americans usually use a computer or some other kinds of electronic products in the hour before bed.
Researchers found that man-made light from some electronic products at night might reduce the levels of the brain chemicals that help sleep. The researchers showed that sitting in the light from tablets clearly reduced the levels of the chemicals which manage our body clocks and play a great role in the sleep cycle.
In the study, the researchers let volunteers read, play games and watch movies on a tablet for different time while measuring how much light their eyes received. They found that sitting for two hours before a bright tablet at night reduced the levels of the chemicals by about 22%.
Studies of students using computers at night have got the similar results. And researchers said that might not only cause sleeplessness, but also increase the risk of obesity(肥胖症), diabetes(糖尿病) and other diseases.
To be on the safe side, the researchers advise us to use computers less before bed, or turn down our screens low.
1.What can we learn from the first paragraph?
A.Americans don't get enough sleep. B.Electronic products are very popular.
C.The brain becomes more active at night. D.Sleep experts never use smartphones.
2.How many electronic products influence people's sleep?
A.By making our brains more tired. B.By making our bodies weak.
C.By reducing the levels of the brain chemicals that help us sleep. D.By changing our body clocks.
3.What does the underlined word "that" refer to?
A.Making a survey about sleep. B.Using smartphones in the daytime.
C.Sitting in a bright room. D.Surfing the Internet at night.
4.What do the researchers advise us to do to have a good sleep?
A.Learn to use smartphones or iPads. B.Watch some relaxing TV programs.
C.Turn down the screens low. D.Try to sleep earlier than before.
九年级英语阅读单选中等难度题查看答案及解析
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In today’s world, sleep experts say that for a better night’s rest, Americans should turn off their smartphones or iPad before sleeping. Such electronic products make the brain more active, and then influence their sleep. But according to a latest survey, more than 90% of Americans regularly use a computer or some other kinds of electronic products in the hour before bed.
Researchers are finding that man-made light from some electronic products at night may reduce the brain chemicals(化学物质) that help sleep. The researchers showed that sitting in the light from computer tablets clearly lowered levels of the chemical which manages our body clocks and plays a role in the sleep cycle.
In the study, the researchers let volunteers read, play games and watch movies on a tablet for different time while measuring(测量) how much light their eyes received. They found that two hours of sitting before a bright tablet screen at night reduced the sleep chemical levels by about 22%.
Studies of students using computers at night have got the similar results. And researchers say that may not only cause sleeplessness, but also raise the risk of obesity(肥胖症), diabetes(糖尿病) and other diseases.
To be on the safe side, the researchers advise us to use computers less before bed, or at the very least turning down your screen as much as possible.
1. What can we learn from the first paragraph?
A. Americans don’t get enough sleep.
B. Electronic products are very popular.
C. The brain becomes more active at night.
D. Sleep experts never use smartphones.
2.The volunteers in the study did the following things EXCEPT _____.
A. listening to music
B. playing computer games
C. watching movies
D. reading electronic books
3. The underlined word “that” probably means ____ in the passage.
A. making a survey about sleep
B. using smartphones in the daytime
C. sitting in a bright room
D. surfing the Internet at night
4.What does the passage tell us to do to have a good sleep?
A. Learn to use smartphones or iPad.
B. Watch some relaxing TV programs.
C. Turn down the screen to the lowest.
D. Try to sleep earlier than before.
九年级英语完形填空中等难度题查看答案及解析
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In today’s world， sleep experts say that for a better night’s rest， Americans should turn off their smartphones or iPad before sleeping. Such electronic products make the brain more active， and then influence their sleep. But according to a latest survey， more than 90% of Americans regularly use a computer or some other kinds of electronic products in the hour before bed.
Researchers are finding that man-made light from some electronic products at night may reduce the brain chemicals(化学物质) that help sleep. The researchers showed that sitting in the light from computer tablets clearly lowered levels of the chemical which manages our body clocks and plays a role in the sleep cycle.
In the study， the researchers let volunteers read， play games and watch movies on a tablet for different time while measuring(测量) how much light their eyes received. They found that two hours of sitting before a bright tablet screen at night reduced the sleep chemical levels by about 22%.
Studies of students using computers at night have got the similar results. And researchers say that may not only cause sleeplessness， but also raise the risk of obesity(肥胖症)， diabetes(糖尿病) and other diseases.
To be on the safe side， the researchers advise us to use computers less before bed， or at the very least turning down your screen as much as possible.
根据材料内容选择最佳答案。
1.What can we learn from the first paragraph?
A. Americans don’t get enough sleep.
B. Electronic products are very popular.
C. The brain becomes more active at night.
D. Sleep experts never use smartphones.
2.The volunteers in the study did the following things EXCEPT ___________.
A. listening to music
B. playing computer games
C. watching movies
D. reading electronic books
3.How may electronic products influence people’s sleep?
A. Make our brains more active.
B. Make our body weak.
C. Lower our brains’ chemicals that help sleep.
D. Change our body clocks.
4.The underlined word ＂that＂ probably means ___________ in the passage.
A. making a survey about sleep
B. using smartphones in the daytime
C. sitting in a bright room
D. surfing the Internet at night
5.What does the passage tell us to do to have a good sleep?
A. Learn to use smartphones or iPad.
B. Watch some relaxing TV programs.
C. Turn down the screen to the lowest.
D. Try to sleep earlier than before.
九年级英语阅读理解中等难度题查看答案及解析
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Experts say that students usually need eight to ten hours' sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children study late. They will think their children work very hard. But not all parents are happy about this. Once a mother told us that every morning her 10-year-old boy put up one finger with his eyes still closed, begging for one more minute to sleep. Like thousands of students " early birds " in China, he has to get up before six every morning.
A report shows that without a good night's sleep, students seem to be weaker than they should be. Many students have fallen asleep during class at one time or another. Too much homework is not the only reason why students stay up late. Some watch TV or play the computer games late into the night.
Experts have said that students should develop good study habits. So some clever students never study late, they are able to work well in class.
1.Many students have fallen asleep in class because_____.
A.they have too much homework to do at night. B.they watch TV late.
C.they play the computer games late into the night. D.All of the above.
2.In the first paragraph " early birds " refers to (指代)people who_____.
A.get to bed early B.get up early C.get to bed late D.get up late
3.If students don’t have a good night's sleep, they seem to be _____.
A.better B.stronger C.weaker D.thinner
4.According to the experts, students should _____.
A.develop good study habits B.work hard
C.go to school before six D.come home late
九年级英语阅读单选中等难度题查看答案及解析
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Expert(专家) say that students usually need eight to ten hours’ sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They will think their children work very hard, but not all parents are happy about this. Once a mother told us that every morning her 10-year-old boy put up one finger (手指)with his eyes still closed, asking for one more minute to sleep. Like thousands of students “ early birds” in China, he has to get up before six every morning.
A report shows that without a good night’s sleep, students seem to be weaker than they should be. Many students have fallen asleep during class at one time or another. Too much homework is not the only reason why students stay up late. Some watch TV or play the computer games late into the night.
Experts have ever said that the students should develop good study habits. So some clever students never study late, they are able to work well in class.
1.The 10-year-old boy asked for more minute to sleep because__________
A. he didn’t have enough sleep
B. it wasn’t time for him to get up
C. he didn’t want to go to school
D. he wanted his moth
er to wake him up2.In this passage we know if students don’t get enough sleep, they may________
A. become too weak to sleep B. not work well in class
C. go to bed early D. be weak in English
3.In this passage “early birds” means “persons who __________”
A. get up early B. get up late
C. sleep less D. don’t want to sleep
4.According to the passage, which of the following is right?_________
A. If you want to study better, you must work hard at night.
B. Sleeping less means working hard.
C. Some clever students are able to work well in class because they have good study habits.
D. Students don’t have
enough sleep because they have lots of homework to do.九年级英语阅读理解中等难度题查看答案及解析
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根据短文内容及首字母提示，填写所缺单词。
Experts say that students usually need eight to ten hour’s sleep at night. But most Chinese students do not get e 1. sleep. Some Chinese parents a 2. usually glad to see their children studying late. They will think their children work very hard. But not a 3. parents are very happy about this. Once a mother told us that every morning her 10-year-old boy put up one finger with his eyes still c 4., asking for one m 5. minute to sleep. Like t 6.of students in China, he has to get up before six every morning.
A report shows that w7. a good night’s sleep; students seem to be weaker than they should be. Many students have fallen a 8. during class at one time or another. Too much homework is not the only reason why students stay u9. late. Some watch TV or play computer games late into the night. Experts have ever said that students should develop good study h 10. . Some clever students never study late, but they are able to work well in class.
九年级英语单词拼写中等难度题查看答案及解析
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About six thousand languages are spoken in the world today. But experts say morn than half of them are in danger of disappearing. 1. As old people die, the language dies with them.
Until recently, most people were not worried about the loss of languages. There was much more concern about the loss of different kinds of plants and animals. 2. They know that when a language is lost, the culture and much of the knowledge of the native community may be lost with it.
Languages are the means by which people find to explain the world they live in. Information about the natural world, such as plants that can be used to heal(治病 ), is often lost when the language dies. 3.
The United Nations Education Scientific and Cultural Organization is trying to solve this problem. 4.
5. Some projects are small. For example, a language speaker and a leaner meet every day for an hour to talk. Other projects are large, such as schools where students are taught in their native language.
阅读以上5段语言材料，请找出与它们相对应的标题，并将其标号填入下列方框内。
A.Some experts say the death of the language is a loss for everyone, not just for the native people who once spoke it.
B.Experts are trying many methods to increase speakers of endangered languages.
C.The endangered languages are spoken by some older members of native groups, but not used for everyday life by younger members.
D.It has been taking steps to develop international policies to support native cultures and save endangered languages.
E.Now, scientists, cultural experts and many other people are concerned about protecting the different languages in the world.
九年级英语其他题中等难度题查看答案及解析
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Experts believe that there are more than 8 million restaurants in the world today. So it might surprise you to learn that restaurants, as we know them, have only existed for a few centuries. Before 1765, there were no restaurants. That is, there were no places that provided the restaurant experience. There was nowhere in which a waiter brought you food and drink that you picked from a menu. In fact, there were no menus anywhere.
There were eating places travellers could go to centuries before that. The countryside was full of inns that would serve food. And there were taverns where one could get drinks. The rich could also eat special meals prepared by private cooks. But none of them could be called a “restaurant”.
A man called Boulanger changed that. In 1765, he opened a place in Paris that sold soups(汤). On his sign he used the word "restaurant" to describe what he was selling. At that time, soups were considered something that could help "restore"(恢复)your health — in French the word "restore" is “restaurer” — so he called the soups "restaurants". Soon, people started buying Boulanger's soups even when they were not ill. And over time, people began to use the word "restaurant" to refer to a place selling soup rather than the soup itself. More "restaurants" opened in France, and people began to buy soups more often.
Later, restaurants in Paris began to serve other food besides soup. In the 1790s, menus started to appear. By the mid-1800s, there were many types of restaurants throughout the world. The United States offered coffee shops. Tea houses became popular throughout China. Paris created beautiful restaurants for the rich. The British began to copy the French, and the restaurant idea spread throughout the British Empire.
Today cities are filled with all types of restaurants. Diners have millions of options from which to choose.
1.What is the passage mainly about?
A. How restaurants developed.
B. What made a good restaurant.
C. Who created the first restaurant.
D. Why restaurants became popular.
2.According to the first paragraph, what made restaurants different from earlier eating places?
A. Restaurants only served food.
B. Restaurants were more expensive.
C. Restaurants were mainly in cities.
D. Restaurants had a list of meal choices.
3.Who did Boulanger expect to come and eat at his restaurant?
A. Rich people.
B. Sick people.
C. Travellers.
D. Workers.
4.When it was first used. what did the word "restaurant" refer to?
A. A person.
B. A place.
C. Illness.
D. Soup.
5.When did restaurants begin to grow internationally?
A. In the 1600s.
B. In the 1700s.
C. In the 1800s.
D. In the 1900s.
九年级英语阅读单选困难题查看答案及解析
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Experts believe that there are more than 8 million restaurants in the world today. So it might surprise you to learn that restaurants, as we know them, have only existed for a few centuries. Before 1765, there were no restaurants. That is, there were no places that provided the restaurant experience. There was nowhere in which a waiter brought you food and drink that you picked from a menu. In fact, there were no menus anywhere.
There were eating places travellers could go to centuries before that. The countryside was full of inns that would serve food. And there were taverns where one could get drinks. The rich could also eat special meals prepared by private cooks. But none of them could be called a “restaurant”.
A man called Boulanger changed that. In 1765, he opened a place in Paris that sold soups(汤). On his sign he used the word "restaurant" to describe what he was selling. At that time, soups were considered something that could help "restore"(恢复)your health — in French the word "restore" is “restaurer” — so he called the soups "restaurants". Soon, people started buying Boulanger's soups even when they were not ill. And over time, people began to use the word "restaurant" to refer to a place selling soup rather than the soup itself. More "restaurants" opened in France, and people began to buy soups more often.
Later, restaurants in Paris began to serve other food besides soup. In the 1790s, menus started to appear. By the mid-1800s, there were many types of restaurants throughout the world. The United States offered coffee shops. Tea houses became popular throughout China. Paris created beautiful restaurants for the rich. The British began to copy the French, and the restaurant idea spread throughout the British Empire.
Today cities are filled with all types of restaurants. Diners have millions of options from which to choose.
1.What is the passage mainly about?
A.How restaurants developed.
B.What made a good restaurant.
C.Who created the first restaurant.
D.Why restaurants became popular.
2.According to the first paragraph, what made restaurants different from earlier eating places?
A.Restaurants only served food.
B.Restaurants were more expensive.
C.Restaurants were mainly in cities.
D.Restaurants had a list of meal choices.
3.Who did Boulanger expect to come and eat at his restaurant?
A.Rich people.
B.Sick people.
C.Travellers.
D.Workers.
4.When it was first used. what did the word "restaurant" refer to?
A.A person.
B.A place.
C.Illness.
D.Soup.
5.When did restaurants begin to grow internationally?
A.In the 1600s.
B.In the 1700s.
C.In the 1800s.
D.In the 1900s.
九年级英语阅读单选困难题查看答案及解析
er to wake him up
enough sleep because they have lots of homework to do.