The main purpose of this passage is to______. The reason why it is difficult to get rid of the threat of global warming is that

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问题 The main purpose of this passage is to______.
The reason why it is difficult to get rid of the threat of global warming is that______.

选项 A、the leaders of many countries are not fully aware of the gravity of the problem
B、world technology is not able to solve the problem
C、not all the countries are willing to make deep cuts in emissions
D、many people welcome the global-warming effect of a warmer summer

答案C

解析 细节题。根据第二段,全球气候变暖的威胁难以排除,主要是因为有些国家不愿采取措施减少对臭氧层有害的气体的排放量。至于技术问题,只是作为补充理由(in addition)。因此C是正确选项。
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