题目内容：

While drunken driving may be on the decline, traffic safety experts remain puzzled over how to deal with another alcohol related danger: drunken pedestrians(行人).

Pedestrians struck and killed by cars often are extremely drunk. In fact, they are intoxicated(喝醉的) more frequently and with higher blood alcohol levels than drunken drivers who are killed in accidents, various studies have shown. Forty percent of adult pedestrians involved in fatal crashes have a blood alcohol level of at least 0.10 which by law in most states signifies intoxication compared to only 25 percent of drivers in deadly accidents, according to recent federal data.

Some types of pedestrain accidents have been declining nationally, especially those involving children, but the number of adult pedestrians who are drunk when killed in traffic has remained relatively steady at 2500 a year. The total number of pedestrians killed annually in U.S. traffic accidents is at least 7000, or one of every seven highway accidents resulting in death.

“We’re dealing here, we think, with a very severe drinking problem that leads to a severe highway safety problem,” said Richard Blomberg, president of Dunlap and Associates Inc, in Norwalk, Coon.

Blomberg, whose consulting company found a very high rate of alcohol involvement in a controlled study of pedestrian accidents in New Orleans, was among several researchers who spoke on the topic at the annual meeting of the Research council’s Transportation Research Board(TRB)  in Washington in January.

Pedestrian accidents have not received enough attention in the past, according to Kay Colpitts, who chairs the board’s committee on pedestrians. Few methods exist to monitor walking habits, she said, and researchers have been mystified（迷惑不解） about how to prevent disasters.

1.Which of the following would be the best title for the passage?

A. Traffic Safety.

B. Drunken Drivers.

C. Drunken Pedestrian Accidents.

D. A Severe Highway Safety Problem.

2.Among the causes of walkers’ accidents, the most serious problem is ________.

A. long delays in traffic signals that may make people cross streets ignoring traffic rules

B. the alcohol level in their blood which is too high.

C. a lack of adult keeping eyes on many children involved in accidents

D. former drunken drivers whose licenses are not allowed to use for a time

3.According to recent federal data, drunken drivers with an over 0.10 blood alcohol level in deadly accidents ____.

A. are 15 percent less than drunken adult walkers with the same level

B. are 2500 a year in US traffic accidents

C. are at least 7000 in US traffic accidents

D. make up one seventh of highway accidents

4.According to the passage, what is Blomberg?

A. A researcher.

B. A specialist in traffic safety.

C. A clerk of a consulting company.

D. A government official