What does the underlined word “it”in Paragraph 7 refer to、

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• 1The underlined part “lubricated the paths” in Paragraph 4 means____.

  A.made the path wet

  B.made the path hard

  C.made the path wide

  D.made the path slippery

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• 2It’s widely believed that the stone blocks were moved to the pyramid site by ______.

  A.rolling them on roads

  B.pushing them over the sand

  C.sliding them on smooth paths

  D.dragging them on some poles

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• 3Why do some birds thrive in noisy environments、

  A.Because there are fewer dangers.

  B.Because there is more food to eat.

  C.Because there is less light pollution

  D.Because there are more places to take shelter.

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• 4What does the underlined word "nocturnal" in Paragraph 5 mean、

  A.Active at night.

  B.Inactive at night.

  C.Active during the day.

  D.Inactive during the day.

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• 5What is the researchers' concern over the increase of birds' song output、

  A.The environment might be polluted.

  B.The birds' health might be damaged.

  C.The industry cost might be increase

  D.D.The people's hearing might be affected.

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• 6Why is rolling better than sliding according to West 、

  A.Because more force is needed for sliding.

  B.Because rolling work can be done by fewer cattle.

  C.Because sliding on smooth road is more dangerous.

  D.Because less preparation on path is needed for rolling.

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• 7What is the text mainly about 、

  A.An experiment on ways of moving blocks to the pyramid site.

  B.An application of the method of moving blocks to the pyramid site.

  C.An argument about different methods of moving blocks to the pyramid site.

  D.An introduction to a possible new way of moving blocks to the pyramid sit

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