单项选择题
In the opinion of the author, （）are being destroyed terribly at present.
A．the oceans B．the atmosphere C．the rain forests D．all the above
单项选择题 Why did Wilson regard" the greatest extinction since the end of the age of dinosaurs" to be the depletion of rain forest areas（）
单项选择题 The word "chop down" in the second paragraph means （）
单项选择题 Though Pasteur was in poor health, he worked hard in order （）
