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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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
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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