单项选择题

"Build on "(Para. 3, Line 1)most probably means______.

A．rely on
B．give up
C．conduct an investigation into
D．pay great attention to
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单项选择题
The passage indicates that the conditions that led to overcrowded roads also brought about______.
A．more attractive .living conditions for many people
B．a healthier younger generation
C．greater occupational opportunities
D．the population explosion
单项选择题
It could logically be assumed that the author of this passage would support legislation to______.
A．ban the use of all pesticides
B．prevent the use of automobiles in the cities
C．build additional conventional power plants immediately
D．organize an agency to coordinate efforts to cope with environmental problems
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