单项选择题

A．He left his notes in class.
B．He had to borrow the notes from his classmates.
C．He doesn’t have an exam.
D．He loaned his notes to a classmat
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单项选择题
A．effectiverB．effectiveC．more effectiveD．most effective
A．effectiver
B．effective
C．more effective
D．most effective
单项选择题
Which of the following is not true according to the passage
A．Human population expands at an exponential rate.
B．Population growth has shown fluctuation in demographic history.
C．Population growth can not be regarded as a social failure.
D．Increase in population is related to productivity.
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