单项选择题

热继电器的动作时间随着电流的增大而（）。

A．急剧延长
B．缓慢延长
C．缩短
D．保持不变

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暴雨是指24小时降水量为40毫米或以上的雨。（）
A、正确
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The author believes that, since the signing of the Kyoto Protocol,______.
A、politicians have started to do something to better the situation
B、few nations have adopted real tough measures to limit energy use
C、reductions in energy consumption have greatly cut back global warming
D、 international cooperation has contributed to solving environmental problems