填空题

The human population growth is the causes of all of the environmental problems.

【参考答案】

Y

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填空题

Global warming, the depletion of the ozone layer in the atmosphere, and destruction of the world’s rain forests have made up of all the environmental problems.

问答题

1. 这种做法的意义何在2．这些大学生能给农村带去什么3．大学生能从中得到什么