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.
单项选择题
A．Because burning them may cause fire accidents.B．Because burning them may cause air pollution.C．Because burning them may cause people out of breath.D．Because burning them may cause water pollution.
A．Because burning them may cause fire accidents.
B．Because burning them may cause air pollution.
C．Because burning them may cause people out of breath.
D．Because burning them may cause water pollution.
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