13．What does the underlined part “grey matter”(in Paragraph 2) refer to?

　　A．Grey hair

　　B．Material of the brain.

　　C．Intelligence.

　　D．Difficult situations

　　14．The experience of learning a second language can ________.

　　A．change one’s brain completely

　　B．improve one’s maths skills

　　C．make one smarter than others

　　D．increase the ability to learn

　　15．We learn from the passage that ________.

　　A．the researchers from UCL did another study in Italy

　　B．a similar study was done on native Italian speakers who learn English as a second language

　　C．the research done on the Italians shows a totally different result

　　D．it will be easier for one to travel around the world by learning a second language

　　16．What’s the main idea of the passage?

　　A．Learning a second language can help improve your brain power.

　　B．You should learn a second language if English is not your native language.

　　C．If you want to learn a second language, you should do it at a certain age.

　　D．The research done by the researchers from UCL is very successful.

　　E

　　The African elephant, the largest land animal remaining on earth, is of great importance to African ecosystem (生态系统).Unlike other animals, the African elephant is to a great extent the builder of its environment.As a big plant-eater, it largely shapes the forest-and-savanna(大草原)surroundings in which it lives, therefore setting the terms of existence for millions of other animals that live in its habitat.

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