问题 单项选择题 B型题

苯并(a)芘属于()

A.一次污染物

B.二次污染物

C.致突变物

D.致畸变形

E.致癌物

答案

参考答案:E

解析:

由污染源直接排入环境,其物理和化学性状都未发生改变的污染物,称为一次污染物,如汞、SO2、可吸入颗粒物、NOX、CO、CO2等。进入环境的一次污染物,在物理、化学、生物等因素作用下发生变化,或与环境中的其他物质发生反应,形成物理、化学性状与一次污染物不同的性污染物称为二次污染物,如光化学烟雾、酸雨、甲基汞等。研究表明,苯并(a)芘是一种具有强致癌性的物质。

单项选择题 A1/A2型题
阅读理解

Every culture has a recognized point when a child becomes an adult, when rules must be followed and tests passed.

In China, although teenagers can get their ID cards at 16, many only see themselves as an adult when they are 18. In the US, where everyone drives, the main step to the freedom of adult life is learning to drive. At 16, American teens take their driving test. When they have their license, they drive into the grown-up world.

“Nobody wants to ride the cheese bus to school,” said Eleanor Fulham, 17. She brought the pressure back to memory, especially from kids from wealthier families. “It’s like you’re not cool if you don’t have a car,” she said.

According to recent research, 41% of 16 to 19-year-olds in the US own cars, up from 23% in 1985. Although, most of these cars are bought by parents, some teens get part-time jobs to help pay.

Not all families can afford cars for their children. In cities with subways and limited parking, some teenagers don’t want them. But in rich suburban areas without subways, and where bicycles are more for fun than transportation, it is strange for a teenager not to have a car.

But police say 16-year-olds have almost three times more accidents than 18 and 19-year-olds. This has made many parents pause before letting their kids drive.

Julie Sussman, of Virginia, decided that her son Chad, 15, will wait until he is 17 to apply for his learner’s permit.

Chad said he has accepted his parents’ decision, although it has caused some teasing from his friends. “They say that I am unlucky,” he said, “But I’d rather be alive than driving, and I don’t really trust my friends on the road, either.”

In China, as more families get cars, more 18-year-olds learn to drive. Will this become a big step to becoming an adult?

小题1:Which may serve as the BEST title of the article?

A.Cars Helping You to Grow-Up

B.Driving into the Grown-Up World

C.Teenagers’ Driving in America

D.Recognized Point of Becoming an Adult小题2:16-year-old drivers have more accidents possibly because           .

A.they want to show themselves off

B.they are never experienced drivers

C.older people always drive better

D.they never drive carefully on the road小题3:Which may NOT be taken into consideration when deciding whether to buy a car?

A.How well off the family is.

B.Whether the kid is old enough.

C.What traffic condition there is around.

D.Whether it’s practically needed.小题4:When Chad said “I don’t really trust my friends ...”, he meant that           .

A.he might run into his friends if he drove

B.he didn’t agree with his friends

C.he might not be safe if his friends drove

D.he was afraid that his friends might well lie to him小题5:The passage mainly gives information about           .

A.an American culture

B.a cultural difference between America and China

C.a change in the Chinese culture

D.the relationship between driving and a person’s development