题目内容：

As self-driving cars come closer to being common on American roads, much of the rhetoric（说辞）promoting them has to do with safety. About 40,000 people die on U.S. roads every year, and driver errors are linked to more than 90 percent of crashes. But many of the biggest advocates of autonomous（自动的）vehicles aren’t car companies looking to improve the safety of their existing products. Huge support for itself-driving technologies is coming from Silicon Valley giants like Google and Apple.

Those of us who have studied the relationship between technology and society tend to look more carefully at the motivations behind any technologically push. In this case, it’s clear that in addition to addressing safety concerns, Silicon Valley firms have a strong incentive（动机）to create a new venue for increasing the use of their digital devices. Every minute people spend on their mobile phones provides data—and often money—to tech companies.

At present, digital devices and driving are in conflict: There are serious, often fatal, consequences when drivers use smartphones to talk or to text. Regulators and safety advocates look to resolve dial conflict by banning phone use while driving – as has happened in almost every state. But the tech companies are taking a different approach. The obvious answer for Silicon Valley is creating an automobile in which continuous cellphone use no longer poses a threat to anyone.

In recent years, the amount of time adults spend on their mobile devices has grown rapidly. At the moment, it’s around four hours a day for the average adult in the U.S. However, that rapid growth is likely to slow down as people run out of time that’s available for them up to use their devices. Unless, of course, there’s a new block of time that suddenly opens up. The average American now spends about 48 minutes in a car every day, a sizeable opportunity for increased cellphone use.

Sop as the public conversation around autonomous cars highlights the safety advantages, don’t forget the tech industry’s powerful desire for more profits, which goes well beyond simply saving us from ourselves.

1.Who are responsible for most traffic accidents in American?

A. Car companies.    B. Drivers.

C. Tech companies.    D. Self-driving cars.

2.What pushes Silicon Valley to promote self-driving technologies?

A. To make more money.    B. To reduce traffic accidents.

C. To limit the use of digital devices.    D. To support car companies.

3.What does the underlined phrase “a new block of time” possibly refer to?

A. The working time.    B. People’s spare time.

C. The time spent in the car.    D. The time spent on mobile devices.

4.What can we know from the passage?

A. We should teach people to strictly obey traffic rules.

B. The writer calls on us to look at autonomous cars wisely.

C. Car companies are the leading promoters of self-driving cars.

D. No solution to the conflict between mobile phone use and driving has been found yet.