题目内容

Many young women are so____on keeping themselves in shape that they take dieting to extremes.

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This organization's aim is to____the quality of life and employment opportunities of people with disabilities.

I would like to thank those organizations that have chosen to____their help to sufferers from AIDS.

水玻璃具有哪些特性？其主要用途是什么？

水玻璃不能用于涂刷或浸渍（），以提高其抗风化性能。

A. 粘土砖
B. 硅酸盐制品
C. 水泥混凝土
D. 石膏制品