单选题：In order to improve our standard of living, we have to accel

题目内容：

In order to improve our standard of living, we have to accelerate production. A．step up
B．speed up
C．take up
D．hold up

参考答案：

答案解析：

Even if in those developed countries, manual work is still n

Even if in those developed countries, manual work is still necessary sometimes.A

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分类：卫生类题型：单选题