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单选题
What will probably be the first stage of change as the sun becomes a red giant?
A
Its core will cool off and use less fuel.
B
Its surface will become hotter and shrink.
C
It will use up its thermonuclear energy.
D
Its center will grow smaller and hotter.
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参考解析
解析：
细节题。题干中的the first stage of change为关键信息，从而定位到文章第二段，该段第二句指出“距今大约五十亿年后，太阳的核会缩小并且会变得更热”，由此可知选项D为正确答案。
细节题。题干中的the first stage of change为关键信息，从而定位到文章第二段，该段第二句指出“距今大约五十亿年后，太阳的核会缩小并且会变得更热”，由此可知选项D为正确答案。
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