Asteroids are bigger versions of the meteoroids that race across the night sky. Most orbit the sun far from Earth and dont threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth.
二段最后两句话的大意是:大多数(小行星)绕着太阳转,离地球很远,不会威胁到地球。但是仍旧有成千上万颗小行星,它们的轨道是要与地球碰撞的。
根据这句话我们可以推断小行星和地球相撞的机率不大,但是确实存在着这样的可能性。因此22题A选项It is very unlikely but the danger exists. (可能性不大,但是危险存在),是正确选项。
例 2 :六级1998年6月32题:
32. Commercials create the sensation of loudness because _______ .
A) TV stations always operate at the highest sound levels.
B) Their sound levels are kept around peak levels.
C) Their sound levels are kept in the middle frequency ranges.
D) Unlike regular programs their intensity of sound varies over a wide range.
32题考察广告听起来很吵的原因,根据关键词Commercial我们可以定位到文章的第二段。在第二段的最后一句话中我们发现了However这一表示强烈转折的词,我们可以将考题定位在二段末两句话。
The sensation of sound involves a variety of factors in addition to its speak level. Advertisers are skilful at creating the impression of loudness through their expert use of such factors. One major contributor to the perceived loudness of commercials is that mush less variation in sound level occurs during a commercial. In regular programming the intensity of sound varies over a large range. However, sound levels in commercials tend to stay at or near peak levels.
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