单项选择题

"A price we have to pay" in the last sentence of par

A．2 means ______.A. something we have to lose or sufferB. a large sum of moneyC. something very expensiveD. something desirable
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单项选择题
The main idea of the passage is that ______.
A．progress doesn't always bring about an improvement
B．modern medicine has made our lives better in some ways
C．the growth in population is partly the result of medical progress
D．progress is too difficult to understand
单项选择题
This passage implies that population increase is ______.
A．not beneficial
B．threatening
C．helpful
D．dangerous
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