题目内容：

    On my fourth day in a self-driving car, I finally felt comfortable enough to let it stop itself. Before then, Id allowed the car- a Volvo S90 sedan to control the direction, with my hands still on the wheel, and to adjust speed in traffic. By Day 4, I was ready to make a jump into the future.

With the car traveling on a busy road, I activated the driverless mode. Soon, a traffic light turned red. For a split second, I prepared to get on the brakes. There was no need. The cameras and computers in the Volvo recognized the traffic conditions and smoothly began applying the brake.

If you're anything like most people, you're familiar with this anxiety. Almost 80 percent of Americans fear traveling in a self-driving car, a recent survey found.

Researchers at the University of Chicago have conducted some clever experiments studying the phenomenon. They asked participants to complete tasks and compared their performance with a computer system's. After the computer made a mistake, people were unwilling to use it again. After the people made mistakes, their self-confidence wouldn't change. It didn't matter that the human beings made more mistakes than the computer. So it is with driving. More than 37,000 Americans died in crashes last year, most from human error. The death count from cars goes beyond that from guns. So if you are shocked and angry by guns and want things to change, you should feel the same about car crashes.

Technology creates an opportunity to save lives. Computers don't get drunk or distracted by text messages, and they don't have blind spots. Just look at commercial airlines: Automation has helped all but get rid of deadly crashes among American air carriers. The last one happened in 2009.

The technology for self-driving cars still isn't good enough. But it is improving rapidly. Within a few years, many cars will have advanced crash-avoidance systems and driving will be revolutionized sooner than many people now understand.

1.How does the author introduce the topic?

A.By offering a piece of news. B.By describing an experience.

C.By giving background information. D.By introducing a latest car.

2.What can we know from the fourth paragraph?

A.The participants lost self-confidence after making mistakes.

B.The participants would ignore the mistakes made by the computer.

C.Car crashes is no less shocking than gun incidents.

D.The death count from cars is the same as that from guns.

3.The author mentioned commercial airlines___________.

A.to advertise for the commercial airlines. B.to assess the security of driverless cars.

C.to find fault with computers. D.to prove the advantage of technology.

4.What's the author's attitude towards self-driving cars?

A.Favorable. B.Indifferent.

C.Skeptical. D.Concerned.