根据短文内容，选择最佳答案。 Hi! My name's Wang Mang. I'm fifteen years old, and I'm a Grade 3 student in Shangjing in the year 2053! I expect you find that pretty hard to believe. Let me explain. This book is a journal I wrote last month for a very special competition. I won the first prize, which was that my book would become part of the first ever experiment in time travel. It would be put in a time capsule to be sent back almost fifty years into the past. So, if everything went according to the plan, you should be reading this in about the year 2005. Do you know what time capsules are? They are usually containers made of some very strong material so strong that it should last for hundreds or thousands of years without being destroyed. Inside these containers, you put things that are typical of the place in which you live. For example, in 2005 you might put a copy of a popular comic, a CD by a famous musician, videos of television programmes-all sorts of things. The idea is that when people in another century open up the time capsule. They'll be able to see what life was like in the past. Until now, all time capsules have been left for people in the future to find. This one is the first that has been sent from the future to the past. I don't understand how it's going to be done, but I think it's a really cool idea. If it works, my own grandparents will be able to read this when they were secondary school students! But if my grandparents did read this, why haven't they ever mentioned it to me? 1. If we believe what the passage says, this book was written ______. [     ] A. last month B. about fifty years ago C. in the future D. by a time traveler 2. Time capsules are usually _______. [     ] A. hundreds or thousands of years old B. made by people in another century C. sent back in time to people in the past D. containers holding objects typical of a certain time and place 3. The main purpose of most time capsules is to ______. [     ] A. show people in the past what life will be like in the future B. show people in the future what life was like in the past C. keep copies of old comics or CDs D. store recording of old television programmes 4. The last sentence shows that Wang Mang finds the idea of time travel ______. [     ] A. confusing B. exciting C. uninteresting D. cool