题目
题型:不详难度:来源:
These things have bright lights. When our eyes see bright lights just before sleep, our sleep patterns (模式) change, a study has found.
Our body clock starts shutting us down for bed at 9 or 10 pm. But bright lights make our minds think that it is still daytime. That wakes us up and leaves us sleepless, experts say.
But if you read a paper book before sleeping, you won"t have this problem. This is because light from a bedside lamp (台灯) does not go straight into our eyes.
Also, if you are watching a television from across the bedroom, you won"t have problems falling asleep. The TV sends light to us from a distance, so the light won"t be as strong.
小题1:The writer tells us to turn off the computer before bed time.
A.half an hour | B.an hour | C.two hours | D.three hours |
A.Reading a newspaper. | B.Talking on QQ. |
C.Reading a book. | D.Watching TV. |
A.We think it is daytime if we leave computers on. |
B.We feel too excited to sleep after using computers. |
C.Lights from computers are brighter than other lights. |
D.Lights from computers can change our sleep patterns. |
答案
小题1:C
小题2:B
小题3:D
解析
小题1:根据文章内容Want a good night"s sleep? Then turn off your computer, cell phone or PSP two hours before you go to bed.可知答案为C
小题2:根据文章内容Our body clock starts shutting us down for bed at 9 or 10 pm. But bright lights make our minds think that it is still daytime. That wakes us up and leaves us sleepless, experts say.可知答案:为B
小题3:根据文章内容大意可知答案为D.
核心考点
试题【Want a good night"s sleep? Then turn off your computer, cell phone or PSP two ho】;主要考察你对科普环保类等知识点的理解。[详细]
举一反三
In most parts of the sea,there are plenty of fishes and plants (植物). Some live near the top of the sea.Others live deep down. There are also a lot of small living things,and lots of fish live by eating them. The sea can be very cold. When people go down, the sea becomes colder and colder. Only some men can go down into the deep sea. But,in 1970,five women scientists lived in the deep sea for fourteen days.
小题1:This writing is ________.
A.a short story | B.about the sea |
C.a news report | D.a poem |
A.The sea is usually very beautiful when it is sunny. |
B.The sea is very terrible when the wind blows hard. |
C.The highest mountain is in the deepest place of the sea. |
D.The deeper the people go into the sea, the colder they would feel there. |
A.1/3 | B.2/3 | C.1/4 | D.3/4 |
A.they live by eating fish | B.they live to eat apples |
C.they are good food for fish | D.they are too small for fish to catch |
A.not only men can go down into the deep sea |
B.women wanted to swim in the sea |
C.women could go deeper into the sea than men |
D.women liked living in the sea |
Like some animals, dolphins use sounds to help them find their way around. They also use these sounds to talk to each other and to help them find food. They do not use their ears to receive sounds,but use the jaw--the lower part of the mouth.
It is strange that dolphins are friendly to men, and for thousands of years, there are many stories about dolphins and men. In the 19th century, in a dangerous part of the sea near New Zealand,there was a dolphin. The seamen liked him very much and gave him a very good name, Jack. From 1871 to 1903 ,Jack met every boat in the area and showed it the way. In 1903 a passenger on a boat with the name of The Penguin shot and hurt Jack. Luckily the dolphin didn"t die, and after a long time he was well again. He guided the ships through the area for nine more years, but he refused to help the boat of the Penguin.
Today, some people still kill dolphins, but many countries in the world now protect them. In these places, people are not allowed to kill them.
小题1:The word "jaw" means_________in Chinese.
A.下颚 | B.嘴巴 | C.嘴唇 | D.鼻子 |
A.They use their noses to smell the way. |
B.They use their ears to hear the sounds. |
C.They use their eyes to see the way. |
D.They use sounds to find the way. |
A.The writer. | B.A dolphin. | C.A seaman. | D.The passenger. |
A.32 years | B.9 years | C.41 years | D.23 years |
A.Dolphins are not fish. |
B.Dolphins don"t live in groups. |
C.Dolphins are kind and friendly to people. |
D.Dolphins can live a long life. |
Do you eat healthy food every day? It’s important (重要)for your health. You need fruit, like oranges, apples and bananas. “ An apple a day can keep away(避开) the doctor (医生).” You also need vegetables, like carrots and broccoli. Fruit and vegetables are good for our health. But don’t eat lots of chocolate. It’s not good healthy food. What about dessert? Don’t eat lots of dessert because it’s not good for your health. Many people eat lots of chocolate and dessert, so they are unhealthy. Sports can also keep you healthy. Play sports every day. Don’t be lazy. You can be healthy.
小题1:What are healthy food?
A.Fruit and vegetables. | B.Bananas, apples and chocolate. |
C.Fruit and dessert. | D.Vegetables and dessert. |
A.Food. | B.Sports. | C.Healthy food. | D.Healthy food and sports. |
A.The doctor doesn’t like an apple. |
B.You don’t need a doctor. |
C.You bring an apple to the doctor and he runs away(跑走). |
D.You eat an apple a day and you can be healthy. |
A.健康 | B.不健康 | C.饥饿 | D.不饿 |
A.Everyone is healthy. | B.We need to be healthy. |
C.Food isn’t important. | D.A doctor is important. |
On Earth, we put food on a plate. Gravity holds the food down and keeps it on a place. But there is almost no gravity in space, so food can float (漂浮)away, and astronauts must eat carefully.
Sleeping is very different in space. Some astronauts like to float in the air, but most like to be in a sleeping bag. They tie the bag to a wall so that they won"t float away at night.
Exercise is very important in space. On Earth, your legs carry your body, but in space, astronauts float, so they do not use their legs often. This is very bad for their legs, so they must exercise for thirty minutes every day.
After a day"s work, astronauts relax. They may listen to music, read, watch films, play games, or talk to their friends and families on the radio. Sometimes they just enjoy floating in the air.
小题1:What does the underlined word "gravity" mean in Chinese?
A.平衡 | B.引力 | C.磁性 | D.重力 |
A.Because in that way they won"t float away. |
B.Because that makes them sleep well. |
C.Because they can"t get to sleep if they don"t do that. |
D.Because the sleeping bag is not safe enough. |
A.It is about the importance of gravity. |
B.It is about astronauts" everyday life in space. |
C.It is about the differences between space and Earth. |
D.It is about how to avoid (避免) floating away while sleeping. |
Colours are not all the same to monkeys. For example, if we put food in a red box, and do this every day, a monkey will always go to the red box to get food. If we put food in a blue box, the monkey won’t go to it.
小题1:Scientists show the dogs colours ____________.
A.to tell them to eat |
B.to find out if they can see black and white things |
C.for fun |
D.to find out if they can see colours |
A.hear different pieces of music | B.see the monkeys |
C.see black things | D.see all the colours |
A.all the same to monkeys | B.not all the same to dogs |
C.different to dogs | D.not all the same to monkeys |
A.the red box to get food | B.the blue box and put food in it |
C.the blue box to get food | D.the red box and put food in it |
A.Scientists find that dogs don’t like colours. |
B.Dogs like to hear different pieces of music. |
C.Monkeys like the food in the box. |
D.Monkeys will not go to the blue box if we don’t show them before. |
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