【概括大意】Radar is now a familiar tool. Like many others it was an unexpected discovery. It was first observed by two researchers, who were studying sound communication. They were sending signals from a station on one side of a river in Washington D to a vehicle across the river. They discovered that their signals were stopped by passing ships. They recognized the importance of this discovery at once.The main idea of this paragraph is__________.

【概括大意】 "Speed Reading" courses teach students how to read more quickly. In such courses, teachers often ask students to find out how many words a minute he is reading. You can do this too: look at your watch every 5 or 10 minutes and write down the page number you have reached.The main idea of this paragraph is__________.

【完成句子】Amongst the most popular books being written today are those which are usually classified as science fiction. Hundreds of titles are published every year and are read by all kinds of people. Furthermore, some of the most successful films of recent years have been based on science fiction stories.People enjoy___________.

【概括大意】Take the case of Eta Carinae, one of the most explosive stars in the universe. This star produces ultraviolet laser rays(紫外线) and it will destroy itself in a few million years’ time. It is five times brighter than the sun and when it explodes it is going to be a sight worth waiting for!The main idea of this paragraph is__________.

【概括大意】When a consumer finds that an item she or he bought is faulty or in some way does not live up to the manufacturer’s claim for it, the first step is to present the warranty(保单), or any other records which might help, at the store of purchase. In most cases, this action will produce results. However, if it does not, there are various means the consumer may use to gain satisfaction. The main idea of this paragraph is __________.

【完成句子】Lack of sleep can affect everything from our emotions to how well we focus on tasks like driving. It can affect sports performance, increase our chances of getting sick, and may be linked to weight gain in some people. You’ve probably noticed how much running around little kids do — and how soundly they sleep. Take a tip from a toddler and get at least 60 minutes of exercise a day. Physical activity can decrease stress and help people feel more relaxed. Just don’t work out too close to bedtime because exercise can wake you up before it slows you down.Lack of sleep can increase our chances of ___________.

【概括大意】Volunteering gives you an opportunity to change lives, including your own. If you’re feeling frustrated or overwhelmed by the news of a disaster, volunteering to help can be a great way to cope. If you’d like to support a cause but can’t afford to donate money, you can donate your time instead. Helping others in need is such an important part of the American way of life that many high schools require their students to spend a certain number of hours volunteering in order to graduate. Volunteering is a great way to learn new skills — from working as part of a team to setting and reaching goals. It gives you a chance to discover what kinds of things you’re best at and enjoy the most. A volunteer job that you love can even help shape your ideas about your career goals.The main idea of this paragraph is __________.

【完成句子】In the United States, credit card fees have become a political issue. Congress has threatened to take action against some bad behavior by lenders. But getting a credit card has become a lot easier for most people. And many cards offer low rates at first, especially if people agree to move their money from another card. In the USA, Congress has threatened to take action against some bad behavior to _____.

【概括大意】On October 19, 1911, Amundsen set out from his base in Bay of Whales, Antarctica, with four companions (同伴), 52 dogs and four sleds. His success in reaching the South Pole was aided by careful planning. His use of sled dogs to carry supplies also helped. Amundsen and his men, along with 11 surviving dogs, made it back to the base on January 25, 1912, quicker than expected. The main idea of this paragraph is __________.

【完成句子】Music is an expression of emotion and imagination. Music frees the soul. It soothes the body and spirit. It relaxes. It energizes. It calms. It motivates. Music is fun and interesting, educational and beautiful. It helps us remember who we are and from where we came. Imagine a world with no music. Trying to erase music from our minds is nearly impossible. What can you do to preserve the music which influences you. Music frees our soul and relaxes our _____________.