【简答题】Today Newton is a very clean place. Many years ago, however, there were millions of rats in it. They attacked the cats and dogs. Sometimes a great number of them knocked down a man or woman walking ho...
【单选题】听力原文: Millions of years ago, whales lived on land and walked on four legs. Today, whales still have small bones that are the remains of their hind legs, but these bones can only be seen on the inside ...
【单选题】Cell Phones:Hang Up or Keep Talking? Millions of people areusing cell phones today. In many places it is actually considered unusualnot to use one. In many countries, cellphones are very popular with ...