题目内容

Introducing a new product into the market is a highly____business, which calls for careful planning.

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

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？