根据短文内容，从A、B、C、D四个选项中选出一个能填入相应空格内的最佳答案。 The computer is a very wonderful machine today, and it’s so 1 that it seems that we 2 live or work without it. Computers are used in many 3 , such as offices, factories, big shops, schools and even homes. With the computer people are living a better 4 . The computer is one of the greatest inventions in the 20th century. The first computer 5 in America in 1946 which was named ENIAC, and it was not only very 6 , but also quite heavy. It was as