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题型：单选题题类：真题难易度：普通

Air pollution is becoming more and more serious, actions must be taken to stop it.

A、so B、but C、or D、until

举一反三

— Don't look down upon Bob. He has great talent in basketball.

— Oh, yes. ________others are weak, he is strong.

—I am worried about ________ I can enter a good high school or not.

—Take it easy. Believe in yourself!

—We should work hard. We'll never give up. China dream can come true.

—I think so. Let's try our best.

_________________ it got dark, they worked hard there.

Many people read newspapers ____ they can learn what's happening in the world.

______________ you can't answer the question, we'd better ask someone else.

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