根据下面内容，回答题：

　　Luckily, the back tires of their car stayed on the road. Otherwise, the young couple would have

　　driven right into a pit twenty feet wide and thirty feet deep!

　　The man and woman were coming home from a party. They were enjoying the landscape aroundSwansea, Wales. Suddenly, they found the front of their car leaning into a huge hole. The car barely hung onto the edge of the pit. It swayed back and forth like the arm of a balance.

　　In their precarious position,the couple knew that each movement they made could be a matterof life and death. Slowly, slowly, they edged toward the backseat. Then each opened a back door. An don the count of three,they jumped out together. The accident was so scary that they ran a long way before they calmed down. But later they returned to see what had happened. They found that a big chunk of the road had sunk into the ground! And at the bottom of the pit lay their car--roof down and wheels up.

　　Was this mystery of the sunken road ever solved? It turned out that an abandoned mine shaftlay under the road. It had collapsed and taken the pavement with it. Layers of tunnels intersect be-neath the city of Swansea. The tunnels were built so many years ago that no one knows where they end or begin. The tunnels are shaky, like those that ants build in the sand. No one knows when the entire city might collapse.

　　36This passage is primarily about __________ .

　　A.driving carefullyB.the city of Swansea, WalesC.a road that caved inD.tunnels that ants build

　　参考答案：C

　　参考解析：

　　本文讲了一对夫妇因道路塌陷而经历的一次险情。C项是正确的。cave in“塌陷”。

　　37It is probably true that _________

　　A.the other roads in Swansea are pretty safeB.other sections of Swansea will cave in sometimeC.everyone should move out of SwanseaD.Swansea is a very interesting city

　　参考答案：B

　　参考解析：

　　最后一段指出这座城市的地下有座被遗弃的煤矿，煤矿坑道的倒塌带动了道路的下沉，整座城市随时都会倒塌。B项是正确的。

　　38The writer creates interest in the first sentence by using _________

　　A.a funny storyB.romantic imageryC.a vivid descriptionD.a precise argument

　　参考答案：C

　　参考解析：

　　作者在文章的一开始就生动地描述了这对夫妇所处的险情。c项是正确的。

　　39The underlined word "precarious" in the third paragraph means _________

　　A.unexpectedB.DangerousC.unusualD.ridiculous.

　　参考答案：B

　　参考解析：

　　第三段整段都在描述这对夫妇的危险境地，他们采取的冒险的自救方式等等，这些都充满了危险。B项是正确的。unexpected“出人意料的”;dangerous“危险的”;unusual“不平常的”;ridiculous“愚蠢的”。

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