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问题 填空题

把一条20厘米长的纸条对折一次后再对折一次，两次对折后每段长是全长的______，每段长是______厘米．

答案

1÷4=

1
4
，

20÷4=5（厘米）；

答：两次对折后每段长是全长的

1
4
，每段长是5厘米．

故答案为：

1
4
，5．

选择题

原始大气的成分主要有（　　）

A．甲烷、氨气、氢气和氧气

B．甲烷、氧气、氢气和二氧化碳

C．甲烷、氨气、氢气和水蒸气

D．氨气、氧气、氢气和水蒸气
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单项选择题

Middletown’s police currently remove an apparently abandoned car from the streets about two months after it is reported. The police have been unfairly criticized for allowing such cars to be vandalized during this period. Because it is illegal for car owners to abandon cars on the street, police need not be concerned about protecting such cars.
Which of the following, if true, most seriously weakens the argument above

A．In the past, vehicles abandoned in Middletown were removed from the streets an average of four months after initial reports to police.

B．In one recent year, more than 150 abandoned vehicles were vandalized in Middletown, but police made no arrests for those actions.

C．Some cars initially classified by Middletown’s police as abandoned were later reclassified as stolen vehicles.

D．Middletown’s understaffed police force must give the disposition of abandoned cars low priority because of the number of violent crimes now committed there.

E．(E) In the most recent year for which data are available, there were 28 percent fewer reports of abandoned vehicles than the yearly average for the previous ten years.
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