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
<上一题 目录 下一题>
热门 试题

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
The best definition of biosphere . as it is used in the text is.
A．the protective envelope formed by the atmosphere around the living earth
B．that part of the earth and its atmosphere in which life can exist
C．the living things on earth whose existence is made possible by circulation of the atmosphere
D．the circulation of the atmosphere's contribution to life on earth
相关试题