What does the phrase “clam up” in Paragraph 2 probably mean、

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• 1The main purpose of the text is to tell parents ________.

  A.how to deal with a teenager

  B.how to protect a teenager from danger

  C.how to be the good friend of a teenager

  D.how to be the good parent of a teenager

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• 2Why was Wesley Autrey praised as a hero、

  A.He helped a man get across the rails.

  B.He stopped a man from destroying the rails.

  C.He protected two little girls from getting hurt.

  D.He saved a person without considering his own safety.

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• 3What did the Baby Einstein Company do at its beginning、

  A.Produce safety equipment for children.

  B.Make videos to help protect children.

  C.Sell children’s music and artwork.

  D.Look for missing and exploited children.

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• 4Mutombo believes that building the new hospital is ________.

  A.helpful to his personal development

  B.something he should do for his homeland

  C.a chance for his friends to share his money

  D.a way of showing his respect to the NBA

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• 5What was Mutombo praised for、

  A.Being a star in the NBA.

  B.Being a student of medicine.

  C.His work in the church.

  D.His willingness to help the needy.

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• 6The last paragraph is about how to teach a teenager ________.

  A.to use the phone in a proper way

  B.to pay for his own telephone

  C.to share the phone quickly

  D.to answer the phone quickly

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• 7What should parents do in raising a teenager according to the text、

  A.Not allow him to learn driving or take drugs.

  B.Give him advice only when necessary.

  C.Let him have his own telephone.

  D.Not talk about personal things with him.

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• 8What is the text mainly about、

  A.The terrible conditions in the Antarctic.

  B.A special fish living in freezing waters.

  C.B.A special fish living in freezing waters.C.The ice shelf around Antarctica.

  D.Protection of the Antarctic cod.

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• 9Why can the Antarctic cod live at the freezing temperature、

  A.The seawater has a temperature of -1.88℃.

  B.It loves to live in the ice-salt mixture.

  C.A special protein keeps it from freezing.

  D.Its blood has a temperature lower than -2.05℃.

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• 10What does the underlined word “it” in Paragraph 5 refer to、

  A.A type of ice-salt mixture.

  B.A newly found protein.

  C.Fish bloo

  D.D.Sugar molecul

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