题目内容：

Traffic jams seem a sure companion of national holidays. On May 1, there were constant traffic jams on highways leading out of the several metropolises, the longest, according to reports, was 55 kilometers. Some blame the jams on the two-year-old policy that allows cars with no more than seven seats to use the highways for free on public holidays, but a Beijing News editorial said this is not the real cause of the jams.

The growing automobile culture is doubtlessly among the causes. Data shows that China’s production and sales of automobiles both went up by 20 million in 2013. But over the same period there has been no breakthrough in highway construction, and when there are too many birds the nest will naturally become crowded.

Growing tourism also leads to the jams. At the 2014 global summit of the World Travel and Tourism Council, which ended last week, it was reported that Chinese people spent almost 3 trillion yuan on tourism in 2013, which took up more than 90 percent of hotel income and more than 80 percent of air and railway use.

Worse, Chinese have to travel during the same periods. As employees’ rights to paid leave often fail to be protected, many have no choice but to travel on the limited public holidays. From Oct 1 to 7, the so-called Golden Week, almost every tourist site will be full of visitors. Therefore it is wrong to blame the free-pass policy.

That does not mean the government should stand idle doing nothing. As traffic jams during the holidays are predictable, they could develop more public transport and strengthen legal supervision to ensure that every employee enjoys their entitlement to a paid vacation or offer free passes on other days to encourage people to travel on days other than public holidays. The measures might not prevent traffic jams, but they may at least ease the jams.

1.How many factors are mentioned in the passage accounting for the traffic jam on the highway?

A. two      B. three       C. four      D. five

2. What can we infer from the passage?

A. Traffic jams often happen on highways on national holidays.

B. People prefer to stay at home because of traffic jams.

C. Chinese people spent over 3 trillion yuan on tourism in 2013.

D. There is nothing the government can do to prevent traffic jams.

3. What does the underlined sentence (Para.2) mean?

A. highway construction cannot meet the demand of increasing cars.

B. the more highways are built, the less crowded it will become.

C. the rapid increase of cars is the direct cause of traffic jam on highways.

D. limits should be set on the use of private cars.

4.Which of the following ways can ease the jams according to the passage?

A. People drive private cars to spend holiday.

B. People take trains to spend their holiday.

C. Employees can have an expense-paid vacation.

D. People make use of public holidays to enjoy themselves.