If you've ever stayed up late and then got up early the next day, you know what it's like to not get enough sleep. It's a very uncomfortable feeling. In fact, scientists have long believed that sleep is like food ——if we don't get enough of it, we might get sick or even die. But now they are starting to wonder just how much sleep we need.
Researchers from London recently did a study on fruit flies （果蝇）. They found that flies that slept for very short periods of time —— about 72minutes a day —— still lived about as long as flies that slept for longer time. One of the flies slept for just 4 minutes each day. This has led the researchers to wonder if sleep is less necessary than we thought before.
Humans are very different from fruit flies. Sleep is when our bodies do a lot of work, for example, repairing tissue（组织）and growing muscle （肌肉）.Sleeping allows our bodies to get a good rest.
But can we really die from not sleeping? No human has died so far from staying awake for too long. The world record for sleeplessness is held by Randy Gardner from the US, who stayed awake for 11 days and 24 minutes in 1964. However, Gardner did experience serious side effects （副作用）.
Scientists have not yet found any animals that don't sleep at all. Even animals that only sleep for short periods are not completely sleepless. This suggests that a short sleep is necessary, even in short-sleeping animals, according to a German scientist.
1.What does the study on fruit flies show?
A.Fruit flies sleep less than humans do.
B.Flies need 72 minutes of sleep every day.
C.Sleep is as necessary for animals as it is for humans.
D.Getting less sleep doesn't seem to influence how long flies live.
2.The purpose of Paragraph 3 is to________.
A.describe how much sleep humans need B.explain why sleep is important to humans
C.list the differences between humans and flies D.show the similarities between flies and humans
3.What do we know from the passage?
A.Sleep may not be so important as we think it is. B.Humans need more sleep than animals.
C.Sleeplessness can lead to death. D.Not all animals need sleep.
4.What’s the best title for the passage?
A.How Much Sleep? B.Die Without Sleep.
C.Wonders of Nature. D.Get Enough Sleep.
九年级英语阅读单选中等难度题
If you've ever stayed up late and then got up early the next day, you know what it's like to not get enough sleep. It's a very uncomfortable feeling. In fact, scientists have long believed that sleep is like food ——if we don't get enough of it, we might get sick or even die. But now they are starting to wonder just how much sleep we need.
Researchers from London recently did a study on fruit flies （果蝇）. They found that flies that slept for very short periods of time —— about 72minutes a day —— still lived about as long as flies that slept for longer time. One of the flies slept for just 4 minutes each day. This has led the researchers to wonder if sleep is less necessary than we thought before.
Humans are very different from fruit flies. Sleep is when our bodies do a lot of work, for example, repairing tissue（组织）and growing muscle （肌肉）.Sleeping allows our bodies to get a good rest.
But can we really die from not sleeping? No human has died so far from staying awake for too long. The world record for sleeplessness is held by Randy Gardner from the US, who stayed awake for 11 days and 24 minutes in 1964. However, Gardner did experience serious side effects （副作用）.
Scientists have not yet found any animals that don't sleep at all. Even animals that only sleep for short periods are not completely sleepless. This suggests that a short sleep is necessary, even in short-sleeping animals, according to a German scientist.
1.What does the study on fruit flies show?
A.Fruit flies sleep less than humans do.
B.Flies need 72 minutes of sleep every day.
C.Sleep is as necessary for animals as it is for humans.
D.Getting less sleep doesn't seem to influence how long flies live.
2.The purpose of Paragraph 3 is to________.
A.describe how much sleep humans need B.explain why sleep is important to humans
C.list the differences between humans and flies D.show the similarities between flies and humans
3.What do we know from the passage?
A.Sleep may not be so important as we think it is. B.Humans need more sleep than animals.
C.Sleeplessness can lead to death. D.Not all animals need sleep.
4.What’s the best title for the passage?
A.How Much Sleep? B.Die Without Sleep.
C.Wonders of Nature. D.Get Enough Sleep.
九年级英语阅读单选中等难度题查看答案及解析
I often have to stay up late. Then I sometimes find it hard to stay ________ the next day.
A.wake B.awake C.waking D.asleep
九年级英语单选题中等难度题查看答案及解析
If you _______up late, you will feel tired the next day.
A. will stay B. have stayed
C. stay D. were staying
九年级英语单项填空中等难度题查看答案及解析
If you _______up late, you will feel tired the next day.
A．will stay B．have stayed
C．stay D．were staying
九年级英语单项填空中等难度题查看答案及解析
He seldom stays up late at night, necessary, to keep himself full of energy the next day.
A. if B. unless C. since D. though
九年级英语单项填空中等难度题查看答案及解析
He seldom stays up late at night, ______ necessary, to keep himself full of energy the next day.
A.if B.unless C.until D.while
九年级英语单选题中等难度题查看答案及解析
Yesterday was my grandmother’s 60th birthday. My parents and I got up early in the morning, and then we took the subway to______ home. After we arrived, my mother________lunch in the kitchen. My father played_______ with my grandfather in the living room. They like to play chess and they are in a chess club. I ______ with my grandmother about my school life. She was very interested in it. At lunchtime we gave our ______ to my grandmother. My parents_______ a beautiful dress for her. I drew ______ picture as her birthday gift. We sang the birthday song (歌) together (一起), _______she made a wish before blowing out the candles. We had a very delicious lunch. ______ lunch, we went to the park and took many photos. How_______ we were!
1.A. her B. his C. my D. your
2.A. ordered B. had C. cooked D. sold
3.A. ping-pong B. chess C. games D. cards
4.A. spoke B. said C. talked D. told
5.A. gifts B. luck C. help D. messages
6.A. paid B. found C. washed D. bought
7.A. a B. an C. the D. 不填
8.A. or B. but C. and D. so
9.A. At B. After C. For D. Before
10.A. tidy B. friendly C. smart D. happy
九年级英语完型填空困难题查看答案及解析
Della，don't stay up late， you will feel sleepy the next day．
A．so B．or C．but D．and
九年级英语单项填空中等难度题查看答案及解析
When I got to the bus stop. I missed the early bus and I had to____ the next one.
A. give up B. keep off
C. call off D. wait for
九年级英语单项填空中等难度题查看答案及解析
When I got to the bus stop. I missed the early bus and I had to _____ the next one.
A.give up B.keep off
C.call off D.wait for
九年级英语单项填空中等难度题查看答案及解析