阅读理解。

     One day Mr and Mrs White went shopping by car. They stopped their car near the store. They bought

a lot of things and they wanted to put the things in the car. But Mr White couldn't open the door of the car,

so they asked a police-man to help them. The policeman was very friendly to help them. Just then a man

came up and shouted: "What are you doing with my car?" Mr and Mrs White took a look at the car's

number-Oh, no! It isn't their car.

1. Mr and Mrs White went            .

A. fishing  

B. shopping

C. business

2. They stopped their car            .              

A. near the park

B. near the sea

C. near the store

3.They wanted to put the things            .  

A. in a big bag      

B. in their car

C. in the  box

4. Mr White can't open thecar, so            .

A. they walked home

B. they asked a policeman for help            

C. they went home by bus

5. The policeman was _         .

A. excited  

B. helpful    

C. friendly

简述国际环境法的概念与特点。