问题 选择题

It was a pity that when we got to the cinema, the movie___ , so we saw only the end of it.

A.was finishing

B.has just finished

C.just finished

D.had just finished

答案

答案:A

题目分析:考察时态。句意:真遗憾啊!当我们到达电影院的时候,电影就要结束了,所以我们只看到了电影的结尾。根据句意说明我们到的时候,电影还没有结束,不过就要结束了。故使用过去进行时代替过去将来时。表示按照计划安排就要发生的事情。故A正确。

点评:英语中将来时有多种表达法。Be to do sth表示计划的事情;或者表示注定要做某事;也可以表示命令做某事,相当于have to, must,should; will表示一般的将来,或者临时决定做某事;be going to do sth表示按照计划安排要做某事;或者根据某种迹象要做某事;be about to do sth即将做某事,不与表示将来时的时间状语连用。现在进行时表示一般将来时,表示按照计划安排要发生的事情,且动词要是一些表示位置变化的动词。

单项选择题
单项选择题

Aristotle believed that the heavens were perfect. If they ever were, they are no longer. The skies above Earth are now littered with the debris (残骸) of dead satellites, bits of old rockets and the odd tool dropped by a spacewalking astronaut. Such is the extent of the detritus that the first accidental collision between two satellites has already taken place. It happened in February 2009, when a defunct (废弃的) Russian Cosmos smashed into a functioning American Iridium, destroying both and creating even more space junk.

To stop this sort of thing happening again Vaios Lappas of the University of Surrey, in England, has designed a system that will remove satellites from orbit at the end of their useful lives--and as a bonus will scour part of the sky clean as it does so. Dr. Lappas’s satellite-removal system employs a solar sail. As light from the sun hits the sail, it imparts a minuscule but continuous acceleration. When a satellite is first launched, the sail is angled in a way that causes this acceleration to keep the satellite in orbit. (Orbits gradually decay as a result of collisions with the small number of air molecules found even at altitudes normally classified as "outer space". )

Solar sails have yet to be used widely to propel spacecraft in this way--several earlier versions came unstuck when the sails failed to unfurl properly-but doing so is not a novel idea in principle The novelty Dr. Lappas envisages is to change the angle of the sail when the satellite has become defunct. Instead of keeping the derelict craft in orbit, it will, over the course of a couple of years, drag it into the atmosphere and thus to a fiery end. Not only that, but the sail will also act like a handkerchief, mopping up microscopic orbital detritus such as flecks of paint from previous launches. A fleck of paint may not sound dangerous, but if travelling at 27 000kph (17 000mph), as it would be in orbit, it could easily penetrate an astronaut’s spacesuit.

A prototype of Dr. Lappas’s design, called CubeSail, will be launched late next year. It weighs just 3kg and, when folded up, measures 30cm (12 inches) by 10era by 10era. Once unfurled, however, the sail will have an area of 25 square metres. If this prototype, which is paid for by EADS, a European aerospace company, proves successful, solar sails might be added to many future satellites. That would enable them to be removed rapidly from orbit when they became useless and would restore to the skies some measure of Aristotelian perfection.

If the CubeSail turns to be practical, the design will ()

A. be granted a patent to reward Dr. Lappas

B. make our skies return to be perfect

C. be still useless to remove the satellites from orbit

D. be applied to all the future satellites