文档介绍：英语听写作文听写 1 Unidentified Flying Objects There are many explanations for why UFOs visit the earth. The most popular one is that they may contain visitors from other s. To fly such an aircraft, their builders must develop different forms of aviation, because they seem to fly much faster than normal aircraft. The UFOs, it is believed, must contain scientists from other s who are studying life on earth. It is even believed that several such aircrafts may have landed on earth, and the space visitors may be living amongst us. But there are also less fantastic explanations available. Although some sightings of UFOs are difficult to explain, most can be explained quite easily. In many cases the observers might have made a mistake. They might have seen a weather balloon or an aircraft. Or the light we have saw in the sky reflected from the ground onto the clouds. However, the exact cause of many sightings still remains a mystery. 听写 2A market strategy Asa traveler in other countries, you will never get the local ’s price in the market, but that doesn ’t mean you shouldn ’t try. Take your time, especially with significant purchases. If you want to buy an expensive carpet, for instance, stop by the shop for a few days running to see if the “ final price ” there has e less certain. If it hasn ’ t, disappear for a few days to let the shop owner sweat before e back to continual negotiation. I