B. Kepler 452b is one of the planets in the Milky Way.
C. Doug Caldwel and Jeff Coughlin are both research scientists on the Kepler Mission.
D. More than 4,000 planets outside the Solar System still cannot sustain life now.
1. C. 细节理解题。根据第三段中的“…its location could mean that it is just entering an uncontrollable greenhouse period of its climate history.”可知,“它的位置可能意味着它正在进入它的气候历史中不可控制的温室阶段”的说法只是一种推想,而不是已经进入了。句中的“could”是关键词,它表明了一种假想的情况。故答案为C项。
2. D. 细节理解题。根据第三段第一句话和第五段第一句话可知,答案应为D项。
3. A. 推理判断题。根据第二段第一句话“Kepler 452b, which has been named Earth 2, is six billion years old.”和第三段第一句话中的“Since the planet is 1.5 billion years older than Earth,…”可以推知答案应为A项。即地球存在的时间是:(6 billion –1.5billion = 4.5 billion)年。其余各项虽然表述是正确答,但都是原文直接提到的内容,不是推断出来的。
阅读下列短文,从每题所给的四个选项(A、B、C、D)中,选出最佳选项。
(2016·延安模拟) Graham and his friends preferred to shoot_up in their arms, necks and legs. A dealer once said Graham was the type who would never be able to turn back and that he expected him to die from the drug. Wendy feared the same, but didn't know how to save her son.“Once, after he'd disappeared for more than a month, I found him at a friend's house with a bunch of other users,” she said, “I got down on my hands and knees, begging him to come home. He did, but the next morning he was gone.I don't know what made him do it, but I drove 20 miles to the nearest train station.Graham was headed for Seattle, his pockets full of drugs.If I hadn't gotten there in time, I would never have seen him alive again.”
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