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单选题
When have annual carbon emissions quadrupled?
A

Since the late 18th century.

B

Since the mid-20th century.

C

Since the 1950s.

D

In a recent 12-month.

参考答案

参考解析
解析：
从录音中提到的“In fact, annual emissions have quadrupled since the mid-20th century”，可知从自从20世纪中期，每年的碳排放量增加了4倍，因此选B。
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