Have been sitting
动词的时态 备考要点：英语中常用的时态有 12 种。在英语（一）考试的 词形填空题 中，经常被测试的动词时态有：一般现在时、一般过去时、 一般将来
Have you finished your paper yet?
6. 将来完成时 Will have + 过去分词 By the time you are back this evening, I’ll have done all the work. By the time we get to their house, they will have finished____(finish) supper. (2003 上
Transmission
9) The number of violent acts on televisions in the past years __ has increased __ (increase) from about 19 to 27 per hour. (15A 2004 上 ) 10) Your mind _ will keep ___ (keep) up with your reading sp
Telecommunication via Satellite
LESSoN EIGHT TEXT Telecommunication via Satellite At the beginning of the twentieth century, there were four powerful means of transmitting and receiving information over long distances: print, photog
What people Dont Know about Air
Most of them travel 40,000 miles to a satellite and then back to earth. Ten years ago, a satellite was capable of receiving and transmitting more than 33,000 telephone conversations simultaneously. No
Without air, there would be no fire
Without air, there would be no fire. There would be no cars or trucks, since motors need air in order to work. Without air, there would be no wind or clouds. There would be no weather, as we know it.(
Diamonds
Lesson Six Text A Diamonds Diamonds are rare, beautiful, and also quite useful. They are the hardest substance found in nature. That means a diamond can cut any other surface. And only another diamond
It is said eportedestimatedknown
Scientists know that the combination of extreme heat and pressure changes carbon into diamonds. Such heat and pressure exist only in the hot, liquid mass of molten rock deep inside the earth. It is th
Learned Words and popular Words
Diamonds, as they are found , do not look very impressive. They are gray, greasy-looking pebbles. Experienced diamond miners can tell(distinguish) a diamond immediately. But some people have carried a
Former
First, there are those words ( with which we become familiar in ordinary conversation) , which we learn ， that is to say, from the members of our own family and from our friends, and which we should
Be used to + N
（所发资料 30 页） 2. As is known, light much faster than sound. A. traveled B. travels C. is traveling D. has traveled 3. The teacher told the students that the earth around the sun. A. went B
How Should You Build Up Your Vocabulary?
LESSoN NINE (B) TEXT B How Should You Build Up Your Vocabulary? Through Context When students in a college class were asked what should be done when they came across a new word in their reading, eight
Environmental protection
After all, those first two steps or approaches spark a stronger than usual interest in that dictionary definition. Youre now personally involved. Did you find out the word meaning? Your heightened int
Scientific Attitudes
LESSoN TEN TEXT A Scientific Attitudes Science had its beginning when man started asking questions about his environment. He wondered where the sun went at night and why the sky was blue. He questione
