问题 选择题

NA为阿伏加德罗常数,下述正确的是[ ]

A. 80g硝酸铵含有氮原子数为2NA

B. 1L 1mol/L的盐酸溶液中,所含氯化氢分子数为NA

C. 标准状况下,11.2L四氯化碳所含分子数为0.5 NA

D. 在铜与硫的反应中,1mol铜失去的电子数为2 NA

答案

答案:A

阅读理解

阅读理解。

    Everybody in Britain talks about the weather, It's the most common subject of conversation, "Isn't a nice

day?" "Do you think it will rain?" "I think it's going to be windy." These are common ways of starting a

conversation.

    Many people think they can tell what the weather is going to be like. But they hardly ever agree with each

other. One man may say, "Do you see how cloudy it is in the east? It's going to rain tomorrow" Another man

will say, "Yes, it's cloudy in the east. But I think we are going to have fine weather tomorrow."

    People often look for the weather they want. When a farmer needs water, he looks for something to tell

him it's going to rain. He won't believe anything else. When some friends have a picnic, they're so sure the

weather is going to clear up very quickly that they sit down and eat their lunch while it rains.

    Almost everyone listens to what the weatherman says. But he doesn't always tell us what we want, and

once in a while he makes a mistake. Still, he usually comes closer to being correct than anyone else.

1. We usually ______ when we start a conversation with our friends in Britain. [ ]

A.say hello to them

B.ask them to sit down

C.pass them some drinks

D.talk about the weather

2. Why do many people hardly ever agree with each other when they talk about tle weather?[ ]

A.The weather changes very quickly.

B.They don't listen to weatherman.

C.Nobody can tell what the weather is going to be like.

D.Each of them looks for the weather he wants.

3. The writer thinks the weatherman ______. [ ]

A.always makes mistakes

B.makes fewer mistakes than anyone else

C.never makes a mistake

D.tells us the weather we hope for

选择题