题目内容
（请给出正确答案）
[主观题]
The author believes that, since the signing of the Kyoto Protocol,A．politicians have start
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
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