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老年性耳聋的临床表现特点
A 突然发病
B 双耳对称性听力下降
C 先是对低音调听力下降
D 与过量吸烟嗜酒无关

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氯霉素最严重的不良反应是
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Why WTO should pay more attention to developing countries and development issues?

A．Developing countries have huge economic size.
B．There are a few developing countries.
C．Because WTO pay attention to developing countries only.
D．It is one of WTO’s mission.