A. are exposed lo more skillful hunters

　　B. have moved to habitats with fewer plants

　　C. haven't adapted themselves to climate change

　　D. can't change their fur color into white in the fall and the spring

　　71. The problem faced by volcano rabbets and rock rabbits is that________.

　　A. both are affected by 1ess snow

　　B. both are affected by rising sea levels

　　C neither can find enough food

　　D. neither can migrate to higher places

　　E

　　Do you know how it is when you see someone yawn and you start yawning too? Or how hard it is to be among people laughing and not laugh yourself? Well, apparently it's because we have mirror neurons (神经元）in our brains.

　　Put simply, the existence of mirror neurons suggests that every time we see someone else do something, our brains imitate ()it，whether or not we actually perform the same action. This explains a great deal about how we learn to smile, talk, walk, dance or play sports. But the idea goes further： mirror neurons not only appear to explain physical actions y they also tell us that there is a biological basis for the way we understand other people.

　　Mirror neurons can undoubtedly be found all over our brains, but especially in the areas which relate to our ability to use languages, and to understand how other people feel. Researchers have found that mirror neurons relate strongly to language. A group of researchers discovered that if they gave people sentences to listen to (for example: “The hand took hold of the ball”), the same mirror neurons were triggered as when the action was actually performed (in this example, actually taking hold of a ball).

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