题干

一个恒容容器中盛有1molNO2,发生反应:2NO2(g)⇌N2O4(g),反应达到平衡时,混合气体中NO2所占体积分数为M%.保持温度不变,再投入1molNO2,达到平衡时,混合气体中NO2所占体积分数为N%.则M和N的关系是(  )

A:M>N

B:M<N

C:M=N

D:不能确定

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A

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根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Do you know that over ten million American kids go to camp every summer ?____ Back then, hot city summers made people feel bad and even unhealthy for children, so escaping to the country for a few weeks became popular. Today, kids have different reasons for making camp a part of their lives.

To meet new people

    Camp is a great way to make new friends and learn about different places and cultures. Michiko, 13, put it like this, “I loved camp. I met this girl named Manny who lives in New York and she is cool.____We taught each other words.”

    To challenge (挑战) yourself

    ____Activities like trying new sports, learning new games, or pushing yourself to achieve something need a lot of courage. Arabella, 13, told us, “I went to summer camp and I passed my swimming test! I can hardly swim, so it was a big progress.____

    To experience nature

    There's a great big natural world out there, and going to camp helps you learn how beautiful and important it really is.____Getting out into the woods or mountains can give you a better understanding of the world.

A. Not all the things that kids do at camp are easy.

B. She speaks Spanish and I speak Japanese.

C. I felt great afterwards.

D. It's also a great way to learn about teamwork.

E. Summer camp has been a U.S. tradition for over 150 years.

F. Going to camp is all about having a good time.

G. Without trees, soil, water, and wildlife, the Earth couldn't survive.