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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