B.be specially trained
C.improve soil quality
D.poison you
E.be eaten
F.affect their nutritional content
30、 The closer a plant is to its natural state; the less suitable it is to__________.
A.show that organic crops are safer than conventional ones
B.be specially trained
C.improve soil quality
D.poison you
E.be eaten
F.affect their nutritional content
第4部分:阅读理解(第31~45题,每题3分,共45分) 下面有3篇短文,每篇短文后有5道题。请根据短文内容,为每题确定1个最佳选项。
31、
根据下列材料,回答31-45题
Why Dont Babies Talk Like Adults?
Over the past half-century, scientists have settled on two reasonable theories related to babytalk. One states that a young childs brain needs time to master language, in the same way that it does to master other abilities such as physical movement. The second theory states that a childs vocabulary level is the key factor. According to this theory, some key steps have to occur in a logical sequence before sentence formation occurs. Childrens mathematical knowledge develops in the same way.
In 2007, researchers at Harvard University, who were studying the two theories, found a clever way to test them. More than 20000 internationally adopted children enter the US each year. Many of them no longer hear their birth language after they arrive, and they must learn English more or less the same way infants do -- that is, by listening and by trial and error. International adoptees dont take classes or use a dictionary when they are learning their new tongue and most of them dont have a well-developed first language. All of these factors make them an ideal population in which to test these competing hypotheses about how language is learned.
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