3．Kristina called bilingualism “a beautiful natural experiment” because

　　.

　　A．people grow up，benefiting from speaking two languages

　　B．people speaking two languages are natural

　　C．people speaking two languages are beautiful

　　D．people speaking two languages like the experiment

　　答案　A

　　解析　细节理解题。根据第五段中的“...because people grow up speaking two languages，and studies have shown that they get certain cognitive benefits from switching between languages and determining which to respond with based on what’s going on around them.”可知，是因为人们长大后会得益于说两种语言。故选A。

　　4．We can learn from the last paragraph that learning a second language in childhood is

　　.

　　A．dangerous to children

　　B．not beneficial to children

　　C．dangerous but beneficial to children

　　D．not dangerous but beneficial to children

　　答案　D

　　解析　推理判断题。根据最后一段可推断在儿童时期学习第二语言是有益无害的。故选D。

　　B

　　(建议用时8′)

　　There is a technology that may someday be widely used as a way to identify people.An American doctor can plant a computer chip under his skin which can send personal information to a scanner.The chip gives off information which will be scanned by a hand­held reader.

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