问题 选择题

夏天从冰箱里取出瓶装矿泉水,会发现瓶的外壁“出汗”,这是因为(  )

A.水会从瓶内慢慢渗出

B.空气中的水蒸气遇冷液化

C.瓶外壁的水不断汽化

D.瓶周围的空气不断凝华

答案

矿泉水瓶“出汗”指的是矿泉水瓶外壁上有水,水是液态的,是由空气中的水蒸气遇到比较冷的矿泉水瓶形成的,气态变为液态,是液化现象.

故选B.

单项选择题
阅读理解

The blue eyes that looked at him from outside the door were like the light through a maginifying glass (放大镜) when it is at its brightest and smallest, when paper and leaves begin to smoke.

"Hey . "  said the man in the door.  " Remember me? "

" Yes. "  the boy said. whispering.  "Rick. "

He felt so surprised to see Rick. All of Rick seemed to be shown in the eyes. With a strong feeling that ought to have hurt him.

" You knew me."  Rick said.  " You hadn't forgotten. "

" You're--just the same. " the boy said. and felt much thankful.

He seemed even to be wearing the same clothes, the same blue shirt and grey trousers. He was thin, but he was built to be lean; and he was still, or again. sunburnt. After everything, the slow white smile still showed the slight feeling of happiness.

" Let's look at you." Rick said, dropping into a chair. Then slowly he felt more at home, and he became once more just Rick as if nothing had happened. There were lines about his eyes. and deeper lines on his cheeks. but he looked like-just Rick, lined by sunfight and smiling.

" When I look at you." he said,  " You make me think about me, for we look like each other. "

" Yes, " said the boy, eagerly,  " they all think we both look like my grandfather. "

小题1:On his return. Rick_______.

A.had not changed much

B.looked very old

C.was much thinner than before

D.was wearing different clothes小题2:Rick and the boy are probably________.

A.brothers

B.related

C.friends

D.neighbours小题3:You could describe Rick as________.

A.old and friendly

B.old and nervous

C.thin and nervous

D.thin and friendly小题4:From the passage we can tell that the boy_____.

A.was worried that Rick had forgotten him

B.was proud of what Rick had done

C.was pleased to see Rick

D.wondered where Rick had been小题5:Rick and the boy_______.

A.had similar personalities

B.cared about each other

C.had lived in the same house

D.felt their friendship had changed