阅读理解。 Do you want to say that what you think in a letter to Jimmy Carter, president of the United States? You will get an answer from him-written in ink, not typed-after only a few days. Jimmy Carter gets about 4,000 letters every week. He answers every letter on special White House paper. But he doesn't need a lot of time for it. In fact, he only gives 20 minutes a week to look at his private letters. He has the most modern computer in the world to help him. It costs about US$1,200,000. This computer has its own rooms on the first floor of the White House: It has a lot of electronic pens (电 子笔) and they write like the President writes, in his favourite light blue ink. Each letter takes less than a second to write. A White House official said,'It's not important that the letters come from a computer. Each letter says what the president wants to say.' 1. What is the passage mainly about? A. President of the United States B. The letters of president C. President's computer D. How president writes letters 2. How long does the computer spend in writing a letter? A. A minute. B. An hour. C. A second D. Less than a second. 3. How long does he spend in reading his private letters every week? A. Twenty minutes B. Twenty seconds C. Ten hours D. Half an hour 4. The computer cay say ______ in its letters. A. the same words B. the different words C. the words that president wants to say D. the words 5. The computer is very ______. A. clever B. friendly C. cheap D. useless