The main purpose of this passage is to______. In the passage the author implies that______.

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问题 The main purpose of this passage is to______.
In the passage the author implies that______.

选项 A、it is always difficult to work out international agreements to cut down emissions harmful to the ozone layer
B、it is no longer easy to reach international agreements relating to the environment
C、the world has recently become aware of the threat of global warming
D、the problem of global warming has largely been solved

答案B

解析 推断题。文章开头就说,在日本京都召开的关于全球气候变暖的会议表明,要达成有关环境问题的国际协议现在已变得非常复杂,单是禁止某些活动或减少某些物质的排放是不够的。B与此相符。
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