单项选择题
The author use the word "grassroots" (Line 1, Para. 2) to mean ______.
A.the roots of grass
B.the ordinary people
C.the leaves of grass
D.the leaders
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单项选择题
This passage is mainly concerned with ______.
A.the seriousness of environment decay
B.Green Movement and its influence
C.green architecture
D.people's responsibility to protect environment
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