IF 虚拟语气句型：不论主语是单数还是复数，其虚拟语气动词都只能用过去式，be 动词只能用 were。表示与实际情况不一致，亦或表达某种愿望或期望，本句表示与对未来的愿望。注意，现代英语语法也允许使用 be 动词的 was 形式接单数主语。
While this may seem like a very small change, it shows that-if a dangerous asteroid was heading toward us-it would be possible to knock it off its course, keeping Earth safe. The chances of Earth actually being hit by an asteroid large enough to cause damage are very small.12. What ...
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What If an Asteroid Hit Earth?Holly Cefrey
D.NASA's Double Asteroid Redirection Test failed. 答案(1)段落大意题。根据文章第一段By visiting these near Earth objects to study the material that came from the solar nebula,we can look for answers to some of humankind's most arresting questions,such as:How did the solar...
阅读理解 Scientists are worried that an asteroid(小行星)will possibly hit the earth in 2036.If scientists are right planet earth is 24 years away from a major disaster. Scientists h
Scientists are worried that an asteroid(小行星) will possibly hit the earth in 2036. If scientists are right, planet earth is 24 years away from a major disaster. Scientists have been monitoring the progress of a 390-metre-wide asteroid ever since it was discovered last June. They have anno...
Scientists are worried that an asteroid(小行星)will possibly hit the earth in 2036.If scientists are right, planet earth is 24 years away from a major disaster. Scientists have been monitoring the progress of a 390-metre-wide asteroid ever since it was discovered last June.They have announced...
So, to prevent an impact, all we need to do is change the position or velocity of one of the objects along its orbit. Moving Earth would be a massive undertaking (pun intended) and probably not the best idea. We’d need to move the asteroid....
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