Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. The average surface temper

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问题 Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth.
The average surface temperature of Earth keeps around 15℃.

选项 A、Y
B、N
C、NG

答案A

解析 参见文章第2段第1句:The average surface temperature of Earth is about 15℃,由此可判断,地球表面的平均气温一般保持在15℃,所以本题的答案为Y。
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