随着服装市场竞争日益激烈，某品牌服装专卖店一款服装按原售价降价a元后，再次降价20%，现售价为b元，则原售价为（　　）

I             scared of dogs ever since a dog hurt me when I was five years old.

The biggest problem for most plants, which______just get up and run away when threatened, is that animals like to eat them.

       Do you still get free plastic bags from the supermarkets? Things have changed.
       China has banned（禁止）free plastic bags in  shops and supermarkets，and people have to pay for using plastic bags. The rule started on June 1st. It came because our country tried to make less litter. 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 shop ping.
       What kind of shopping bag is the best to bring? Some students in Chongqing 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.
根据短文内容，选择最佳答案。