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单项选择题 What does the speaker suggest people should do when they go shopping
单项选择题 How many solar heat panels do three or four bedroom homes usually need
填空题 What forms flood plain
单项选择题 What can we do to avoid the waste of paper
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单项选择题 Which is NOT mentioned in the passage as a result of the harmful fumes
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单项选择题 What is special with the smog occurring in Los Angeles compared with those occurring in London and New York
单项选择题 Which of the following, according to the author, should play the leading role in the solution of environmental problems
问答题
单项选择题 Which of the following is true according to the last paragraph