GRE考试

【单选题】Human fascination with space began hundreds of years ago. That interest has not waned, and today, the Hubble Telescope orbits 375 miles aboveEarth, working nonstop to unlock the secrets of the universe. The Hubble uses state-of-the-art instruments to provide amazing views of the universe that cannot be matched by ground-based telescopes. The reason for this is that, from the ground, we look at stars and other objects in space throughEarth’s atmosphere. Our atmosphere is full of clouds, dust, and pollution, which cause everything we see to shimmer and shake. This effect creates difficulty for scientists on the ground to make steady, accurate measurements of objects moving in space. With assistance from the Hubble Telescope, astronomers can pinpoint the location of faraway stars and galaxies, and measure the speeds and distances of astronomical objects with far greater precision.Astronomers may even one day tell us exactly when the universe began.

网考网参考答案：B
网考网解析：
The sentence just before the one describing "steady, accurate measurements" explains that Earth’s atmosphere is full of particles that cause distortion for telescopes. The passage also makes clear that all Earth-based telescopes are affected by Earth’s atmosphere. document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>