单项选择题


A．replaced
B．reborn
C．recovered
D．yielded
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单项选择题
A．changeB．changingC．to changeD．being changed
A．change
B．changing
C．to change
D．being changed
单项选择题
In the passage the term human problems or world problems refers mainly to ______.
A．global food shortage
B．resources depletion
C．environmental pollution
D．all of the above
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