66.One of the NASA’s major concerns about astronauts is _____.

　　A. how much exercise they do on the station

　　B. how they can remain healthy for long in space

　　C. whether they can recover after returning home

　　D. whether they are able to go back to the station

　　2.【2015·北京卷】C

　　Life in the Clear

　　Transparent animals let light pass through their bodies the same way light passes through a window. These animals typically live between the surface of the ocean and a depth of about 3,300 feet—as far as most light can reach. Most of them are extremely delicate and can be damaged by a simple touch. Sonke Johnsen, a scientist in biology, says, “These animals live through their life alone. They never touch anything unless they’re eating it, or unless something is eating them.”

　　And they are as clear as glass. How does an animal become see-through? It’s trickier than you might think.

　　The objects around you are visible because they interact with light. Light typically travels in a straight line. But some materials slow and scatter(散射) light, bouncing it away from its original path. Others absorb light, stopping it dead in its tracks. Both scattering and absorption make an object look different from other objects around it, so you can see it easily.

　　But a transparent object doesn’t absorb or scatter light, at least not very much, Light can pass through it without bending or stopping. That means a transparent object doesn’t look very different from the surrounding air or water. You don’t see it ----you see the things behind it.

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