题目内容：

 

In some cities of America, many people ride scooters（脚踏车）.Scooters can be helpful. They help make it so there are fewer cars on the road. This means less traffic. At the same time, it saves energy（能源）.Scooters also give people a way to get to different places around the city easily for less money.

Some people say they cause many problems, however. First, they say riders on their scooters put walkers in great danger because people drive the scooters on sidewalks（人行道）and they sometimes hit walkers carelessly. Second, some say they do not follow traffic rules and go the wrong way on roads so they bring problems to car drivers. Third, sometimes people leave their scooters in the way, so there are scooters in front of the stores and it is bad for the stores.

Scooters are a big problem to the traffic so some scientists are working hard to solve them. At first, some cities like Santa Monica and Los Angeles have some parking spaces for scooters. Then, they prepare to develop new plans for scooter riders. Road safety comes first and they are thinking about making special roads for scooters because they are becoming more and more popular. Someone says they maybe replace（代替）bikes in the future. Finally, online lessons about scooter safety are on the Internet. These riders need to watch a video and finish a test. After passing the test and getting a passing card, they can travel with their scooters on the road. Of course, not every rider can be on his or her scooter after the test.

1.From the first paragraph, we know  _______.

A.people can travel easily B.there is more traffic

C.people are more helpful D.people can’t save energy

2.The underlined word "they" in Para.2 refers to_______.

A.Walkers B.riders C.bikes D.cars

3.In order to solve the scooter problems, people_______.

A.will use scooters to replace cars B.have scooter parking spaces in every city

C.made special roads for scooters D.give Internet lessons about scooter safety

4.We can infer（推断）from the passage that_______.

A.scooters are a big problem to the traffic B.scooter-riders put walkers in great danger

C.it may not be easy to pass the scooter test D.sometimes people leave their scooters in the way