单选题It can be inferred from the passage that the sun.Ais approximately halfway through its life as a yellow dwarfBhas been in existence for 10 billion yearsCis rapidly changing in size and brightnessDwill continue as a yellow dwarf for another 10 billion years
单选题
It can be inferred from the passage that the sun.
A
is approximately halfway through its life as a yellow dwarf
B
has been in existence for 10 billion years
C
is rapidly changing in size and brightness
D
will continue as a yellow dwarf for another 10 billion years
参考解析
解析：
推断题。文章首段第二句指出太阳处于目前的状态已经“4 billion, 600 million years”，文章第二段第二句又提到距今“5 billion years”后，太阳的核会缩小并且会变得更热。该段最后一句指出“太阳将会成为一个红色的巨星”，由此可知太阳作为黄色的矮星的时间几乎已过了一半。故选项A为正确答案。
推断题。文章首段第二句指出太阳处于目前的状态已经“4 billion, 600 million years”，文章第二段第二句又提到距今“5 billion years”后，太阳的核会缩小并且会变得更热。该段最后一句指出“太阳将会成为一个红色的巨星”，由此可知太阳作为黄色的矮星的时间几乎已过了一半。故选项A为正确答案。
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