1 . 听下面一段独白，回答以下小题。
1. What does the speaker think of controlling traffic accidents?

A．Difficult.

B．Easy

C．Uncommon.

2. How many causes of traffic accidents are mentioned?

A．Two.

B．Three.

C．Four.

3. What can help to make highways much safer?

A．Driverless cars.

B．Traditional design.

C．Improved design.