The underlined word “it” in the last paragraph refers to _____.

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• 1The elevators at Seven World Trade Center are special because they can ______.

  A.send people to floors with fewer stops

  B.teach people how to use their ID cards

  C.make people stay very cool in summer

  D.help people go traveling in the building

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• 2_____will be developed and used in the construction industry.

  A.“Green roofs” that cool or heat buildings

  B.“Smart wrap” that catches the sun’s energy

  C.Sunlight-measuring sensors that control lights

  D.Window coating that lets light in, but keeps heat out

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• 3The two letters most probably appear in a ______.

  A.notice

  B.handbook

  C.book review

  D.newspaper

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• 4From the two letters, we can learn Professor Raj Persaud _____

  A.feels doubtful about the value of tipping

  B.believes tipping improves quality of service

  C.wants to ask Hoffman about tipping in the US

  D.thinks tipping a bit more one can get good service

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• 5Johnson’s letter shows_____ .

  A.a stranger in a restaurant is likely to tip a bit more.

  B.diners receive better service if they frequent a restaurant

  C.repeat diners may get good service if they tip a bit more.

  D.the tipping system works to the advantage of new customers

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• 6What might be the most suitable title for the text、

  A.Buildings Are Becoming Smarter

  B.Buildings Are Getting More Sunlight

  C.Buildings Are Lacking in Much Energy

  D.Buildings Are Using Cheaper Materials

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