单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．Burning them completely.
B．Keeping them where they are.
C．Changing them into fertilizer.
D．Using them to cover lawns.
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单项选择题
According to the UN’s prediction, the growth population from now to 2050 is nearly all in ______.
A．western countries
B．African countries
C．developed countries
D．developing countries
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