题目内容

An environmentalist is a person who is concerned with the maintenance of ecological balance, the ______________ of the environment, and protecting and preserving the natural environment.

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Environmental impact is the impact on the environment created by an industry, service, plan, or ___________.

Air pollution is the condition in which air is contaminated by foreign substances, or the substances themselves. It consists of gaseous, liquid, or solid substances that, when present in sufficient concentration, for a sufficient time, and under certain conditions, tend to interfere with human comfort, health or welfare, and cause environmental __________.

__________ is the process of polluting water, air, or land, especially with poisonous chemicals; poisonous or dirty substances that are polluting the water, air, or land somewhere.

Natural environment is __________, weather, and natural resources that affect human survival and economic activity.