题型:阅读选择 题类:模拟题 难易度:普通
江苏省靖江市第三中学2019届九年级下学期英语中考模拟测试试卷(五)
You can not see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting light that falls on them from the sun or some other luminous bodies moon. For example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in our direction. So moon light is only second hand sunlight.
When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.
From small ants to big whales, almost all animals need to sleep. Some sleep a little. Some sleep a lot. And some have special ways to get their sleep.
Seabirds | Some seabirds spend most of their lives over the ocean. And they can sleep while they are flying. They can fly for many hours without moving their wings. |
Flamingos | A flamingo can sleep while standing on one leg. The standing leg always stays straight. The other leg stays close to its body. Its head rests on its back. |
Horses | Horses often sleep standing up. If a horse lies down, it needs a long time to get up. A horse can run from danger more quickly if it is already standing. And horses only need about three hours of sleep a day! |
Giraffes | Giraffes win the prize(奖) for sleeping the least. They sleep about 30 minutes a day, and 5 minutes at a time. They lie down when they sleep. They rest their heads on their bodies or on the ground. What a strange way of sleeping! |
Dolphins | A dolphin sleeps with just half its head at a time. The other half must stay awake(醒着的) to take in air and to watch for danger. Dolphin mothers and babies can go without sleep for as long as two months to stay safe. |
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