题目内容
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提问人：网友w*****2
发布时间：2022年4月6日 11:07
[单项选择题]
The ozone layer, the fragile layer of gas surrounding our planet between 7 and 30 miles above the ea...In Para. 6, the author cites the evidence of changes in the ozone layer over the northern hemisphere to indicate that______.
A．the danger of ozone depletion appear to be intensifying
B．ozone depletion is posing an immediate threat to many marine species
C．scientists are unsure about the ultimate effects of ozone loss on plants
D．CFCs are not the primary cause of ozone depletion in such areas
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