28学位英语：完型填空解题技巧(上)

For reasons of safety and ease of maintenance, Washington and dozens of other communities are building rubber sidewalks made 76 ground-up tires of cars and bikes.

The rubber squares are up to three times more expensive than concrete squares but 77 longer, because tree roots and freezing weather won't crack them. That, 78 , could reduce the number of slip-and-fall complaints made 79 uneven pavements. The shock-absorbing surface also happens to be easier on the joints of slow runners and more forgiving when someone slips or falls. And the rubber sidewalks are considered more environmentally friendly. They 80 a way to recycle some of the estimated 290 million tires 81 out each year in the United States, and they do not restrict tree roots the way concrete squares 82 . Since 2001, a company, Rubber sidewalks, has been grinding thousands of old tires into small pieces, 83 sticky substances and baking the material into sidewalk sections that weigh less than eleven pounds a square foot, or a quarter of the weight of concrete. The rubber squares are how 84 in two colors of gray and orange. The District of Columbia has spent about $ 60,000 to replace broken concrete with the rubber squares here and there in a residential 85 northeast of the Capital.

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81. IAI thrown [BI throwing ICI threw ID] throws

82. [A] doing [B] done [C] did [D] do

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84、A available B accessible C advisable D achievable

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If you feel have a closer relationship with your grandmother on your mother’s side than on your father’s side, it is no surpise researchers at the univetsities of Newcastle and Antwerp.

76 on studies in the Netherlands, they ciaim that matemal grandparents(外祖父母) are likely to make grater efforts to maintain frequent contact 77 their grandchildren than patemal grandparents(祖父母).

They 78 that psycholocgical behaviors related to human evolution are unvoed: women are always sure of their relationship to their sons or daughters, 79 men can never be wholly certain they are their children’s biological fathers.

Furthenore matemal grandparents are always more certain than paternal grandparents 80 a grandchild is related to them :”Thus maternal grandparents may go the extra mile to visit their grandchildren.”

The study , 81 by Thomas Pollet and his colleagues ,found that for grandparents 82 within 30 km of their grandchildren , more than 30 percent of material grandmothers and 25 percent of maternal grandfathers had 83 daily or a few times a week. In 84 , this fell to 15 percent for patemal grandparents.

Mr pollet said: “Even in families where there has been divorce, we found 85 differences. Grandparents on your mother’s side make the extra effort.”

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77 A for B to C in D with

78 A demand B speculate C deny D require

79 A where B whereas C which D why

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82 A departing Bexisting C living D emerging

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84 A time B detail C addition D contrast