We must stop people _____the air and water这是一个选择题 说一下为什么

We must stop people _____the air and water这是一个选择题 说一下为什么 the earth is our home.we must ___the land,air,and water clea people cannot ( ) without air and water.(live) We can't live without air and water.为什么用and不用or啊? Were being boon for there must be air and water 英语二选一选择题.Air and water ( ) important.【is；are】 Polluted air and water are hamful to people's health. people can't live without water or air为什么是or we must do something to stop people from______. we will die without air and water 哪里错了? We have air pollution,water pollntion and land pollntion.（中文 we have air pollution,water pollution and land pollution.句意相