单项选择题

A．The poor.
B．The unemployed.
C．The old.
D．The young.
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单项选择题
The word this in Line 4, Para. I refers to ______.
A．the results of recent research
B．dangers inherent in the nature of weeds
C．risks of altering crops’’ genetic make-ups
D．threats posed by chemicals used to kill weeds
单项选择题
According to this passage, the start of the Industrial Revolution in Europe generated the appearance of the word boredom and the word interesting .
A．Y
B．N
C．NG
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