单选题：We've seen a marked Shift in our approach to the social issu

题目内容：

We've seen a marked Shift in our approach to the social issues.
A．clear
B．regular
C．quick
D．great

参考答案：

答案解析：

在浓度为40%的糖水中加入5千克水，使浓度变为30%。现在要使糖水浓度变为50%，需要再加（　）千克糖。

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The document was compiled by the Department of Health.A．written B．printed C．atta

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Soy will become one of the most popular foods in the 21st century.

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In the process, the light energy converts to heat energy.A．reduces B．changes C．l

分类：卫生类题型：单选题