Do you still get free plastic bags from the supermarkets? Things have changed.
China has banned free plastic bags at shops and supermarkets, and people have to pay for using plastic bags. The rule started on June 1, 2008. It came because our country tried to make litter less. Making super-thin plastic bags has also been banned.
The Chinese once used about 3,000,000,000 plastic shopping bags a day, and they have caused pollution of the environment. The bags have become a main cause of plastic pollution because they are easy to break and people throw them away here and there. So the Chinese people are encouraged to bring their own bags for shopping.
What kind of shopping bag is the best to bring? Some students in Anhui have a good idea. They make their own shopping bags. They use old clothes to make cloth bags, and send them to their parents as presents. They also ask their parents and friends to use cloth bags instead of plastic ones. They think it is their duty to protect the environment.
小题1: People in China have to _____ now.
A．throw plastic bags here and there
B．collect plastic bags in the street
C．pay for using plastic bags at shops and supermarkets
D．use free plastic bags at shops and supermarkets小题2: China made this rule because plastic bags were bad for the ______.
A．environment
B．litter
C．shops
D．supermarkets小题3: Some students in Anhui ______.
A．ask their parents to make cloth bags
B．make cloth bags themselves
C．pick up plastic bags everywhere
D．buy cloth bags for their parents小题4: What’s the main idea of this article?
A．Making super-thin plastic bags has been banned in China.
B．The bags have become a main cause of plastic pollution.
C．Some students in Anhui begin to make their own shopping bags.
D．To protect the environment, free plastic bags have been banned in China.
为原料合成 
单体的第一步的合成路线和最后一步的化学方程式（无机试剂任选）。