13.A 解析:段落大意题。难度中等。根据该段第一句中“Will the Internet make it possible for our entire civilization to fall down together,in one big awful step?”可知,因特网有可能使我们的文明倒退;根据该段第二句“But the Internet has already made it possible for us to use one of our unique advantages—the ability to share knowledge—to a degree higher than ever before.”可知,因特网使我们共享知识成为可能。故A项正确。
Ⅲ.语法填空
Have you ever heard that we humans use only ten percent of our brains? This myth holds __1__ certain appeal because if it __2__ true, then we could instantly become ten times __3__(intelligent) just by firing up that sleepy majority of the brain!
The idea that we use only a small fraction of the brain dates back to animal experiments in the 19th century. When scientists __4__(stimulate) a specific part of the brain, the animal moved __5__ leg or tail. And some scientists assumed that large parts of the brain were simply useless.
Then, in the early 20th century, scientists observed that stimulating certain regions of the brain had no physical effects ,which are __6__ the “silent cortex”. Today we know that much of the “silent cortex” is actually devoted to complex activities like language learning and imagining.
Actually, __7__ we sleep, many areas of the brain are extremely active. Would you be smarter if your entire brain constantly worked to maximum capacity? __8__(interest) enough, the opposite is probably true. The less brain activity you need to perform a __9__(give) task, the more the brain as a whole is capable __10__ doing.
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