How to ________ the difficult situation is a big problem to everyone.

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阅读下面的短文，从A、B、C、D四个选项中选出最佳选项。

　　The United States is full of cars．But there are still many families 　1　 cars，while some families have two or more．However，cars are used for 　2　 joy．They are a necessary part of 　3　．

　　Cars are used for 　4　．They are driven to offices and factories by workers who have 　5　 to get to their jobs．When 　6　 are sent to different parts of the city，they have to drive in order to 　7　 their goods．Farmers shave to drive into cities in order to buy things．

　　Very often small children 　8　 be driven to school．In some cities school buses are used only 　9　 children who live more than a more than a mile 　10　 school．When children are too young to walk 　11　 far，their 　12　 take turns to drive them to school．One mother dives on Monday，taking her own children and the 　13　 as well．Another mother drives on Tuesday，another on Wednesday 　14　．So people say they 　15　 a carpool（合伙组成车队）．Men also form carpools-three or four of them take turns to drive to the place 　16　 they all work．

　　More carpools should be formed in order to put 　17　 cars on the road and to use less oil．Car-parking space is a great problem，and 　18　 is the over busy road in and around cities．Too 　19　 cars are being driven．Something will have to be done about the 　20　 of cars．

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Our boat floated on between walls of forest. It was too thick to allow us a view of the land we were passing through, though we knew from the map that our river must from time to time be passing through chains of hills which crossed the jungle plains. Nowhere did we find a place where we could have landed: where the jungle did not actually spread right down into the river, banks of soft mud prevented us form going ashore. In any case, what would we have gained by landing? The country was full of snakes and other dangerous creatures and the jungle was so thick that one would be able to advance slowly, cutting one’s way with knives the whole way. So we stayed in the boat, hoping that when we reached the sea, a friendly fisherman would pick us up and take us to civilization.

As for water, there was a choice. We could drink the muddy river water, or die of thirst. We drank the water. Men who have just escaped from what appeared to be certain death lost all worries about such small things as diseases caused by dirty water. In fact, none of us suffered from any illness as a result.

One day we passed another village, but fortunately nobody saw us. We did not wish to risk being taken prisoners a second time: we might not be so lucky as to escape in a stolen boat again.

1. It can be inferred from the passage that the only thing they could see in a boat was _______.　　 A. walls B. chains of hills　　　 C. tall trees　　 D. vast land

2. From the passage, we can learn that _______.

A. the country was a civilized society　　　 B. the country was a tropical jungle country

C. they found a place where they could land　　 D. they were on a journey home

3. According to the passage, what happened to the people in the boat at last?

A. They were arrested.　　　　　　　 B. They managed to escape to safety.

C. They were saved by some villagers　 D. The passage doesn’t mention it.

4. The best title for this passage might be _______.

A. The Problem of Landing　　　 B. An Adventure

C. An Entirely New Experience　 　　 D. Escape