GRE考试

【单选题】Which of the following, if true, would most seriously undermine the validity of the model of star formation that is presented in the passage
A、A、star is discovered that emits lower levels of trace ions than those discovered by x-rays of our galaxy’s sun.
B、A、section of the universe is discovered to lack both stars and any sort of interstellar medium.
C、A、galaxy is discovered with a negative rate of star formation.
D、In one corner of the galaxy, coronal gas is discovered to rarify as it becomes cooler.
E、A、superbubble is found of equal mass to the galaxy surrounding it.
网考网参考答案：D
网考网解析：
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