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专题滚动检测(十九) (限时：30分钟 语法填空2篇＋完形填空＋阅读理解1篇) Ⅰ.语法填空 A 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 | 
