[問題]GWD27-Q10~Q12

[chris8888]

A few skeptics have
argued that the concentration of mass
necessary to explain the speed of the
(20)whirling gas is not necessarily a black
hole: the concentration in M87 might
be a cluster of a billion or so dim stars.
懷疑論者認為 : 不必然是黑洞.
提出的說法是, 可能是在M87的聚集是一個數十億顆左右的暗行星的叢集.

The same hypothesis might have
been applied to the galaxy NGC 4258,
(25)but the notion of such a cluster’s
existing in NGC 4258 was severely
undermined when astronomers mea-
sured the speed of a ring of dust and
gas rotating close to the galaxy’s
(30)center. From its speed, they calcu-
lated that the core’s density is more
than 40 times the density estimated
for any other galaxy. If the center of
NGC 4258 were a star cluster, the
(35)stars would be so closely spaced
that collisions between individual
stars would have long ago torn the
cluster apart.
說是如果聚集在一起會撕裂.

Q12:
Which of the following, if true, would most clearly undermine the possible explanation for the whirling gas in M87 that is mentioned in the last sentence of the first paragraph?
我懷疑會不會題目有錯? 如果改成in the last sentence of the second paragraph? 那就是答案A了.


A. The stars in a star cluster at the center of M87 could exert a strong gravitational force without tearing the cluster apart.
這句話是說在M87的中間, 行星運用一種重力不讓彼此互撞而撕裂.
怎麼看都是支持第一段的最後一句話, 怪囉!!!
A很像正確答案的選項, 但是在意思上又極端矛盾
B. A cluster of stars at the center would preclude the existence of certain other astronomical phenomena that have been observed at the center of M87.
這也不像是對的.
C. The stars within many existing galaxies, such as NGC 4258, are more closely spaced than are the stars within the core of M87.
D. Only one other galaxy has been observed to contain gas clouds whirling about its center as they do about the core of M87.
E. The gravitational force of a cluster of a billion or so dim stars would be sufficient to cause a whirling ring of gas and dust to collect around the center of a galaxy.
Answer:A

[chris8888]

我考試時有遇到這題, 但他只考兩個題目, 爭議題他沒考.
改成考文章主旨題. 題目忘記了, 大家可以先研究一下他主旨是什麼?