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发布时间：2006-06-23 21:26     点击：

　　A) It is blue.

　　B) It is white.

　　C) It is grey.

　　D) It has no color.

　　2. When an airplane flies too high,

　　A) the air will be too thin to support its wings.

　　B) the air will become thicker.

　　C) the air will exert pressure on it.

　　D) the air will disappear in no time.

　　3. A rocket can fly to the moon because

　　A) it looks like a balloon.

　　B) it is much lighter than an airplane.

　　C) it doesn't have wings.

　　D) it works like an untied balloon.

　　4. Which of the following statements about a rocket is NOT true?

　　A) It can fly when there is no air.

　　B) It can fly without wings.

　　C) It is made of strong metal.

　　D) It is propelled by burning gas inside it.

　　5. A rocket is pushed up into the air when

　　A) hot gas rushes out of its head.

　　B) it is powered by gas.

　　C) hot gas rushes out of its bottom.

　　D) hot gas rushes out of its neck.

　　Keys: DADDC

　　PASSAGE 21

　　Adaptation of Living Things

　　Certain animals and plants develop characteristics that help them cope with their environment better than others of their kind. This natural biological process is called adaptation. Among the superior characteristics developed through adaptation are those that may help in getting food or shelter, in providing protection, and in producing and protecting the young. That results in the evolution of more and more organisms that are better fitted to their environments.

　　Many animals have adaptations that help them escape from their enemies. Some insects are hidden by their body color or shape, and many look like a leaf or a little branch. The coats of deer are colored to mix with the surroundings. Many animals have the ability to remain completely still when an enemy is near.

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