单项选择题

The passage is mainly about ______.

A．energy resources saving
B．environment protection
C．population control
D．air pollution
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单项选择题
A．wonderedB．consideredC．doubtedD．expected
A．wondered
B．considered
C．doubted
D．expected
单项选择题
A．readilyB．patientlyC．angrilyD．rudely
A．readily
B．patiently
C．angrily
D．rudely
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