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问题 填空题

雨篷是由______和______两部分组成。

答案

参考答案：雨篷板 雨篷梁

解析： 本题主要考查的知识点为雨篷的组成。
[要点透析] 雨篷由雨篷板和雨篷梁两部分组成，雨篷梁除支承雨篷板外，还兼有过粱的作用。

单项选择题

雷尼替丁的化学结构是（）。

A.A

B.B

C.C

D.D

E.E
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单项选择题

Air pollution is caused by many things. Great clouds of smoke come from factories. Cars send smoke and fumes into the air. Burning waste fills the air with bits of dirt. Even burning leaves add smoke to the air. Sometimes, planes cannot find their landing spots through smoke. Smoke of all kinds is bad to breathe and can do great harm to the body.
Still, we cannot live without air. We must find a way to clean the air we have.
In time, we may have factories that are run by atomic energy. Our cars may run on smoke-free electric power. Scientists are also working on new ways to help the oil burned by cars from making fumes. Waste may be burned in the sand on ocean floors.
These changes might keep our air clean in the years to come. But until then, many scientists are looking for ways to make air cleaner now.

On the whole, this passage is about ______.

A．dirty air

B．electric power

C．atomic energy

D．burning waste
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