What causes the greenhouse effect?It is __________. [br] What’s the final goa

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问题 What causes the greenhouse effect?
It is __________.
[br] What’s the final goal of the plan?
It is to reduce the missions of the greenhouse gas to __________ by 2010.

选项

答案 1990 levels

解析 本题问计划的最终目标是什么。从文章最后一句话“And the final goal—reduction to 1990 levels by about 2010”,再加上答案中已知的限定词,由此答案应为1990 levels。
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