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题型：单选题题类：模拟题难易度：普通

Stop cutting trees, _______ the earth will become worse and worse.

A、and B、then C、because D、or

举一反三

—It is raining hard, _______the farmers are still working in the field. —So they are.

Work hard at your English, ______ you will fall behind others.

The weather in Kunming is ______ too cold _____ too hot. People like to live there.

It was quiet ________ those big trucks started coming through the town.

—Alice! Are Mary Linda your good friends?

—Yes, they're not in my class.

In Chinese families, people won't start dinner _______ the elders take their seats.

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