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
One reason that children are unable to resist giving personal information on the internet is.
A．it is presented in connection with entertainment
B．they do not know that the information is going to be read by someone
C．they feel they must follow an adult's orders
D．due to their inability to distinguish an advertisement from a non-advertisement
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
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