Passage OneDuring the past several years, many new uses of television sets have been introduced.在过去的几年，新的使用电视的方式出现了。
Video cassette recorders, video games, cable TV, and home computers are becoming popular accessories(附件) for the home TV.视频磁带，游戏机，有线电视以及家庭电脑都成为电视的有机组成部分。
The videodisc(碟片) is the most recent and perhaps the most important of the new home entertainment media.碟片是最新的也是最重要的家庭娱乐媒体。
A videodisc looks like an ordinary record, but it reproduces pictures and sound. 碟片很像一个普通的拷贝，但是它可以记录图像和声音。
It is designed to play back programs that have been recorded on it. 它可以回放储存在上面的信息和程序。
The manufacturers record movies, concerts, and educational programs on the discs.在碟片上可以储存电影，音乐会，以及教育节目。
A videodisc is made of plastic. 碟片是用塑料做成的。
Its surface is covered with tiny pits that wind around the disc in a coil.碟片的表面是一些圆形的凹槽。
The size and arrangement of the pits form a code that represents the recorded pictures and sounds.凹槽的数量和排列可以记录图片和声音。
As the disc spins on the disc player, the player reads the code and translates it into a TVsignal which is then shown on the TV screen.当碟片被放入影碟机，影碟机把凹槽上面的信号翻译成电视屏幕上可以播放的节目。
Manufacturers began developing videodiscs in the 1970’s.20世纪70年代碟片开始被生产出来。
Videodiscs and players have been available for home use since December 1978, and their manufacturers hope that they will become as popular as records and record players. 家庭用的碟片产生于1978年12月，生产商希望碟片可以像唱片那样得到广泛的使用。
Home entertainment, however, is not the only use for videodisc. 然而家庭娱乐并非碟片唯一的用武之地。
Some companies are developing videodisc systems to store computer information and record visual computer programs. 一些公司利用碟片存储信息和记录可视电脑程序。
Home computers may even be used with video players in the future. 在将来，电脑也许会和影碟机共同使用。
1. The passage is mainly about ________.文章主旨A) the videodisc and its functions碟片和它的功能B) the uses of television sets电视机的使用C) home computers家庭电脑D) video cassette recorders 可视唱片2.According to the passage, a videodisc _________.碟片是A) can only reproduce sound只能记录声音B) can only reproduce pictures只能记录图像C) can reproduce pictures and sound可以记录声音和图像D) is only an ordinary record 只是一种普通的唱片3. A videodisc is made of __________.碟片的制作材料A) metal 金属B) plastic塑料C) glass 玻璃D) wood 木头4 .Manufacturers began developing videodiscs in _____.碟片最早生产时间A) the 1960’sB)the 1970’sC) the 1980’sD) the 1990’s5.Which of the following statements about videodisc is NOT true?错误选项A) They can replace home computers.碟片可以代替家庭电脑B) They are used for home entertainment.碟片用于家庭娱乐C) They can reproduce sound.碟片可以录制声音D) They may record visual computer programs in the future.在将来他们可以记录可视的电脑程序Passage TwoThe sea is the largest unknown part of our world.海洋是我们世界未知的部分。
It covers seventy-one percent of the earth. 它覆盖了百分之七十一的地球表面。
There is still much to be discovered about this vast blanket of water.关于海洋还有很多是我们所不知道的。
One of the most interesting projects in oceanography(海洋学) is the work of mapping the ocean floor.在海洋学中最有趣的工程之一是绘制海底地图。
Only a very small part of it has been mapped. 目前我们只绘制了很小一部分海底的地图。
This was not important when only surface ships sailed the world’s oceans, but it can mean the difference between life and death to men in submarines(潜艇).当普通船只航行时海底地图不怎么重要，但是对于潜艇中的人们来说，海底地图就意味着生死。
Long ago there was only one way to find out how deep the ocean was. 很久以前只有一种找到海洋深度的方法。
A seaman could throw a weighted rope over the side of his ship.一名水手从船上把一根很重的绳子投入海里。
Then he pulled the rope up after it had reached the bottom. 然后当绳子达到海洋底部时再把它拉上来。
But this was not a very exact way of measuring.但是，这不是一个精确的测量的方法。
In the twentieth century a better way was found.二十世纪时人们找到了更好的方法。
Sound was used to measure the ocean.人们利用声波测量海洋。
An American Navy ship sailed into a narrow strip of water to conduct an experiment. 一艘美国军舰驶入一个海峡进行这个实验。
Seamen dropped a number of devices that would burst with a loud noise when they hit the bottom. 水手把一些设备投入海里，这些设备在达到海洋底部时会发出很响的声音。
And a little instrument that had been invented measured the time it took for the sound to reach the ship. 这时有一个装臵测量声音从海底达到船的时间。
This has helped oceanographers map the ocean floor.这种测量的方法能够很好的帮助海洋学绘制海底的地图。
Underwater photography is also important in mapping parts of the ocean floor.水下摄影术在绘制海底地图时也非常重要。
With the new methods that have been perfected, cameras can take pictures of the underwater valleys, even in color.随着新技术的日趋成熟，照相机可以拍下水下峡谷的照片，甚至是彩色照片。
1.The sea covers ____________.海洋覆盖了A) less than a quarter of the earth不到地球表面的四分之一B) about half of the earth地球表面的二分之一C) almost three quarters of the earth大约地球表面的四分之三D) more than three quarters of the earth超过地球表面的四分之三2.The work of mapping the ocean floor is very important to 绘制海底地图对于以下哪项很重要____________.A)surface ships普通船只B) people in submarines潜水艇C) ancient people 古代的人们D) an American Navy ship 一艘美国军舰3. According to the passage, a seaman ___________.一个水手A)used to find out the ocean’s depth with the help of a weighted rope过去常常用一条很重的绳子测量海底的深度B) could find out the exact depth of the ocean a long time ago很久以前就可以找出海洋深度的精确深度C) had no way to know the depth of the ocean不知道如何测量海洋的深度D) didn’t care much about the depth of the ocean不关心海洋的深度4.A little instrument can measure the time it takes for the sound to ___________.一个仪器可以测量时间A) hit the bottom of the sea from the ship从船到击中海底部的时间B) reach the ship from the bottom of the sea从击中海底部到传到船上的时间C) burst into a loud noise发出巨响的时间D) disappear into silence 消失的时间5.The main idea of the last paragraph is that _________.最后一段的大意是A)another aid to the mapping of the ocean floor is photography 另外一种绘制海底地图的方法是摄影术B) every camera is able to take pictures in color每种照相机都能照彩色照片C) the ocean floor is perfect as seen in pictures在照片中海底显示的非常清晰D) some new ways of mapping have been found一些绘制地图的新的方法被找到Passage ThreeResearchers say people traveling in traffic are three times more likely to suffer a heart attack.研究者称在交通中的人得心脏病的风险是一般人的三倍。