单项选择题

According to the text, fossil studies of radiolaria are significant because they.

A．live in the depths of the ocean
B．are one-celled
C．have survived through the ages
D．demonstrates climatic changes prior to humans
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单项选择题
The first paragraph of the text deals mainly with the earth atmosphere's.
A．sheltering effect
B．reviving effect
C．invigorating effect
D．cleansing effect
单项选择题
It can be concluded from the passage that.
A．the circulation of atmosphere protects the biosphere and makes life on earth possible.
B．if the protective atmosphere is too damaged by human activity, all life will cease.
C．life is the result of complex interdependent events of nature
D．despite the complexity and power of the atmosphere humans can affect it greatly
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