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题型：单选题题类：常考题难易度：普通

Smile to the world the world will smile back to you.

A、nor B、but C、or D、and

举一反三

— Is she your classmate ________ your cousin?

— She's my cousin.

I have a lot of homework to do today, _____ I cannot go swimming with you.

Science is difficult _____ interesting.

He had to retire(退休) early _____poor health.

Be careful! Don't walk on the grass, it will "cry".

Many people chose to go out for an outing during the National Day holiday _____ the traffic on highways (公路) was very heavy.

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