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
单项选择题
It can be inferred that the next paragraph after this passage would be on the topic that ______.
A．some instances of green construction projects
B．some famous green movement leaders
C．some idealists in the field of environment preservation
D．some specific needs of customers in their projects
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