青蒿中抗疟的主要成分是A．青蒿素 B．青蒿甲素 C．青蒿乙素 D．黄酮类 E．挥发油

China has decided to stop the use of free plastic bags. Supermarkets, shops and outlets(经销店) in China can’t offer plastic bags any more.
Every year, people use too many plastic bags. They throw them here and there, after, they have used them. The government has done its best to deal with them but failed. While we offer quick service to customers, the plastic bags pollute the water, earth and air, and they waste the oil. The government asks people to go back to carry cloth bags and use baskets when they go to buy something. The cloth bags and baskets can be used again and again.
Many months have passed. The environment has been improved a lot.

Action	Make a decision to stop 小题1:     the plastic bags.
小题2:	Supermarkets, shops and outlets
Advantage	Offer小题3:    service to customers
Disadvantage	Pollute water, earth and 小题4:   the oil.
What should we do	Go back to carry cloth bags and use 小题5:   .