Task 7
1. Laptops are lighter than dekstop computers, but heavier than notebooks.
2. The mainframe is the largest type of computer. A minicomputer is larger than a microcomputer.
3. Personal computers are more common than mainframes but mainframes are better than personal computers at
    processing very large amount of data.
4. Minicomputers are more powerful than mainframes but they are also expensive.
5. New computers are faster and sometimes cheaper than older machines.
6. Laptops are often more powerful than PC's but they are not as expensive as PC's.