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第二节：语法填空（共10小题，每题1.5分，共15分）
We usually think of pollution as a harmful waste substance(物质) that threatens the air and water. 31 some people have become concerned about 32 kind of pollution. It can be everywhere, 33 (depend) on the time of day. And it is not thought of as a substance. It is light.
We usually think of pollution as a harmful waste substance(物质) that threatens the air and water. 31 some people have become concerned about 32 kind of pollution. It can be everywhere, 33 (depend) on the time of day. And it is not thought of as a substance. It is light.
