【单选题】Question 2:What do NASA officials think about the thick clouds?
A. They need to be taken seriously.
B. They have a huge effect on fishery.
C. They might be causing trouble to air flights.
D. They may be affecting the world’s climate.
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（）是HTML5中的新标签，定义文档或者文档的一部分区域的页脚。
A.
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