阅读理解（共20小题，每小题2分；满分40分）阅读下列短文，从每题所给的四个选项中，选出最佳选项。AOnline shopping is very popular among most Internet users. Almost 85 percent of Web users in the U. S. shop online. Korea, with 99 percent, is one of the countries where shopping online is very popular. Online shopping is easy, fast and convenient because users can shop from their homes using their computers. While online shopping is easy, there are also things you should be careful about.If you are shopping at an online store, make sure
