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Imagine that you get into your car, tell your car where you want to go, and then let it take you there. This is called self-driving. In fact, the idea behind self-driving cars is very simple. A self-driving car is connected with a computer and the computer is connected with many cameras which can track all the objects close to the car and give the computer all the driving rules and routes (路线) . Then the car can take people to the place where they want to go.
A lot of people are interested in self-driving cars. Research shows that people can save time by using self-driving cars. Besides, self-driving cars can lower the cost of transportation. They can also reduce traffic accidents.
Some experts thought that there would be a lot of self-driving cars on the street in 2020, but in fact, there were only a few self-driving cars on the street in 2020. According to a survey of drivers in 2020, most drivers were cautious (谨慎的) about buying self-driving cars. As the technology is now under research and being improved, it is likely in the near future that we will see a lot of self-driving cars move safely on public roads among traditional cars. When the age of self-driving cars arrives, their cost, safety and convenience will make them become part of our daily lives. If companies that research self-driving cars plan ahead and solve the problems that they have now, they may succeed.
1．What does the underlined word “it” refer to?| A．The computer. | B．The car | C．The camera | D．The route |
| A．They can take pictures of the passengers in the self-driving car. |
| B．They can remind people to get off the self-driving car. |
| C．They can sweep away the objects on the ground. |
| D．They can track all the objects close to the self-driving car. |
| A．The advantages of self-driving cars. | B．The number of cars on the street. |
| C．The high cost of transportation. | D．People’s love for self-driving cars. |
| A．They were seen everywhere. | B．They weren’t fully developed. |
| C．They were too expensive. | D．They were safe on the roads. |
| A．The self-driving cars | B．The driving rules and routes |
| C．The idea behind the self-driving cars | D．The computers of the self-driving cars |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
