单项选择题

According to the passage "progress" doesn't mean that ______.

A．something has become stronger and better
B．something has been changed from being one thing to another
C．something has become funny
D．something turns out to be worse than before

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单项选择题

A price we have to pay in the last sentence of para. 2 means ______.

A．something we have to lose or suffer
B．a large sum of money
C．something very expensive
D．something desirable

单项选择题

This passage implies that population increase is ______.

A．not beneficial
B．threatening
C．helpful
D．dangerous