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[Reading Comprehension]
试题详情
文章：
| Line | This passage is excerpted from material published |
| in 1997. | |
| Is there a massive black hole at the center of our | |
| galaxy, the Milky Way? The evidence is inconclusive. | |
| (5) | Just as the Sun’s mass can be determined, given |
| knowledge of other variables, by the velocity at | |
| which its planets orbit, the mass at the center of the | |
| Milky Way can be revealed by the velocities of stars | |
| and gas orbiting the galactic center. This dynamical | |
| (10) | evidence, based on recently confirmed assumptions |
| about the stars’ velocities, argues for an extremely | |
| compact object with a mass two to three million | |
| times the mass of our Sun. Although according to | |
| current theory this makes the mass at the center | |
| (15) | of the galaxy too dense to be anything but a black |
| hole, the relative lack of energy radiating from the | |
| galactic center presents a serious problem. A black | |
| hole’s gravity attracts surrounding matter, which | |
| swirls around the black hole, emitting some energy | |
| (20) | as it is engulfed. Scientists believe that the amount of |
| energy that escapes the black hole should be about | |
| 10 percent of the matter’s rest energy (the energy | |
| equivalent of its mass according to the equation | |
| E=mc2). But when the energy coming from the | |
| (25) | galactic center is compared to widely held predictions |
| based on how much matter should be falling into a | |
| theoretical central black hole, there is a discrepancy | |
| by a factor of a few thousand. |
题目：
The “serious problem” referred to in line 17 could be solved if which of the following were true?
选项:
A、Current assumptions about how much matter a black hole would engulf proved to be several thousand times too high.
B、Current assumptions about how much matter a black hole would engulf proved to be a few thousand times too low.
C、The object at the center of the Milky Way turned out to be far more dense than it is currently estimated to be.
D、The object at the center of the Milky Way turned out to be far more massive than it is currently estimated to be.
E、Matter being engulfed by a black hole radiated far more energy than is currently assumed.
答案:
A
提问：
这道题错选E，定位会17行看到“the relative lack of energy radiating from the galactic center presents a serious problem”推出解决应该是more energy就选了E（也只有E有“energy”这个关键词，时间有限就直选了）。不知道正确答案A，在考场上应该怎样思路可选出来（没有扫读过文章，看题目直接定位解题的）谢谢老师
解答：
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提问：
这道题错选E，定位会17行看到“the relative lack of energy radiating from the galactic center presents a serious problem”推出解决应该是more energy就选了E（也只有E有“energy”这个关键词，时间有限就直选了）。不知道正确答案A，在考场上应该怎样思路可选出来（没有扫读过文章，看题目直接定位解题的）谢谢老师
解答：
点赞1
阅读783
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