题目内容：

Fumbling with the buttons to find a good song while driving has been linked to increased risk of crashes, but is listening to music risky? “It depends on the music,” says a report published in the October issue of Accident Analysis & Prevention.

The study found teenage drivers who played their own music had significantly more traffic violations（违规） compared with background music designed by the researchers to minimize driving distractions, or no music.

Researchers at Ben-Gurion University in Israel recruited(招募) 85 drivers about 18 years old; just over half were male. The subjects were each assigned to drive six challenging road trips that were about 40 minutes long, accompanied by an experienced driving instructor. Music was played on four trips, two with selections from the drivers' playlists, mostly fast-paced vocals, and two with background music, which was a mixture of easy listening, soft rock and light jazz designed to increase driver safety. No music was played on two trips. Subjects rated their mood after each trip and in-car data recorders analyzed driver behavior and errors.

All 85 subjects committed at least three errors in one or more of the six trips; 27 received a warning and 17 required steering or braking by an instructor to prevent an accident. When the music was their own, 98% made errors; without the music, 92% made errors; and while listening to the safe-driving music, 77% made errors. Speeding, following too close, inappropriate lane use, one-handed driving and were the common violations.

The male subjects were more aggressive drivers and made more serious errors than female subjects. The teens played their own music at a very loud volume but significantly decreased the sound level when listening to the safe-driving music, researchers said. Mood ratings were highest on trips with driver-preferred music.

1.What is the key information the author wants to give in Paragraph 1?

A. Many drivers played their favorite music while driving.

B. Drivers shouldn’t search for the buttons to find a good song.

C. Song selection has nothing to do with increased risk of crashes.

D. Listening to certain types of music can increase drivers’ errors.

2.What does the underlined word “ subjects” refer to in this passage?

A. Something being discussed.    B. People being written about.

C. People being tested.          D. Areas of knowledge or study.

3.In the research, soft rock and light jazz are likely to _______.

A. increase drivers’ safety

B. add to the pleasure of driving

C. change drivers’ idea of safe driving

D. lower drivers’ guard against danger

4.It can be inferred from the passage that in the research ______.

A. the teens committed the most errors

B. the male were more skillful in driving

C. traveling with no music made the least errors

D. driver-preferred music increased the mood ratings