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  3. Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new

Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new

admin2009-06-15  47
问题                     Rescue Platform
In the aftermath of the terrorist attacks on the World Trade Center, security experts are trying to develop new ways of rescuing people from buming skysrapers. One idea is a platform capable of flying vertically and hovering in the air like a helicopter. The platform would rise up and down alongside a skyscraper and pick up people trapped in high stories.
The idea for the vertical takeoff platform was hatched more than ten years ago by a Russian aerospace engineer, David Metreveli, who has since moved to Israel. Metreveli’s dedsign, called the Eagle, calls for two jet engines that turn four large horizontal propellers. The spinning of the propellers generates the necessary lift, or upward force, to raise the platform. The more power is supplied to the propellers, the higher the platform rises. Moving the platform sideways involves applying differing amounts of power to each propeller.
Helicopters are now used in some cases to get people out of buming buildings, Escape baskets slung from them dangle beside the building for people to climb into. Unfortunately, the baskets cannot reach every floor of a building because the ropes from which they hang become unstable beyond a certain length.
So far, Metreveli has built a small-scale model of the Eagle to test his idea. In the wake of September 11, he has been able to secure enough funding to start building a larger, 4-meter by 4-meter prototype, which he calls the Eaglet.
选项 A、Right
B、Wrong
C、Not mentioned
答案B
解析 问题句说“一种被称作为Eagle的救生下台能垂直运动，但不能侧面运动”。借助题十中的特征词Eagle作为答案线索，并注意句子中的修饰词vertically和sideways，这样找到答案相关句： (第2段)Metreveli’s design，called the Eagle，calls for two jet engines that turn four large horizontal propellers． The spinning of the propellers generates the necessary lift，or upward force，to raise the platform．The more power is supplied to the propellers，the higher the platform rises．Moving the platform sideways involves.划线句提到“对每个助推器施加不同的动力，平台就可以侧向移动”，因此判断问题句的说法不正确。
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