【单选题】
What is the discussion mainly about
A、The evolution of interstellar gas clouds.
B、The lifetime of stars.
C、The quality of main-sequence stars.
D、The formation of stars.
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根据网考网移动考试中心的统计,该试题:
3%的考友选择了A选项
18%的考友选择了B选项
1%的考友选择了C选项
78%的考友选择了D选项