2. 外语
  3. In about two years, NASA astronauts will go into space with personal assistants. Robotic assistants, of course. About the size o

In about two years, NASA astronauts will go into space with personal assistants. Robotic assistants, of course. About the size o

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问题    In about two years, NASA astronauts will go into space with personal assistants. Robotic assistants, of course. About the size of softballs, these personal satellite assistants (PSAs) can float throughout the space shuttle or space station, automatically monitoring life support systems, snapping photos, and taking over monitoring tasks from failed sensors. They’re equipped with collision avoidance system so they won’t bump into anything Naturally, they’re wireless. Thanks to their videoconferencing capabilities, the PSAs offer a virtual presence for ground crews and scientists, letting them advise astronauts--in real time --in the midst of their experiments. The PSAs. will be stowed until the spacecraft reaches orbit (天体运行的轨道). And then activated by the astronauts, ground crews, or even by the spacecraft itself or other PSAs requesting help, they can work automatically or respond to voice or radio commands, and can exchange information with the spacecraft’s main computers.
   Floating through the spacecraft, the little robots will measure gas levels, temperature, and atmosphere pressure--making them ideal for checking alarms and dangerous areas, such as the compartment that caught fire on the Mir space station. And, if "smart" identification tags are added to inventory items like food pouches and experiment samples, project manager Yurt Gawdiak of NASA’s Ames Research Center says PSAs could track inventories.
   One of their biggest benefits may be size. By squeezing into hard-to-reach spaces of the shuttle or space station, PSAs can go where no man has gone since the vehicles were first assembled--simply because man doesn’t fit.
选项 A、With the help of PSAs, NASA astronauts can deal with many affairs in the space shuttle or space station more easily.
B、PSAs are mechanical devices which can float all over the space station without any collision.
C、PSAs works only under the voice or radio commands of astronauts.
D、PSAs can track inventories if "smart" identification tags are added to inventory items.
答案C
解析 A项说法我们可以根据通篇的论述找到答案,——PSAs(私人卫星助手)可以胜任很多工作，从而协助宇航人员完成许多任务。故A项是正确的陈述。B项说法可在短文第一段头一句话中推断出来，即PSAs是机器人，可以在太空飞行器或太空站自由飘浮，而不会和其它任何东西产生碰撞，故B项也是正确说法。C项说法我们首先看看第一段的最后一句话里，可以知道PSAs能自动地工作或根据语音或无线电指令来完成工作。而C的说法“PSAs只能依照指令行事”显然不符合短文内容。D的说法则在第二段最后一句话找到正确的答案，它也是正确的陈述。故正确答案是C。
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