单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．May 30th.
B．June 30th.
C．July 30th.
D．August 30th.
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单项选择题
Why is the debate on genetically modified foods more heated in developing countries
A．Because they have a rich range of foods.
B．Because the supply outstrips the need.
C．Because they have to feed fast-growing populations.
D．Because the risks outweigh the benefits.
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