a few centimeters
a few fathoms
a few meters
a few feet
第1题：
The speed of radio waves is equal to ________of light.
A. those
B. that
C. the one
D. the ones
第2题：
In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.
Microwave communication uses high-frequency(71)waves that travel in straightlines through the air. Because the waves cannot(72)with the curvature of the earth, they can be(73)only over short distance. Thus, microwave is a good(74)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(75). These can be installed on towers, highbuildings, and mountain tops.
A．optical
B．radio
C．electrical
D．magnetic
第3题：
根据下面的文字资料回答 71～75 题In the following essay，each blank has fourchoices．Choose the best answer and write down on thean，swer sheet．
Microwave communication uses（ 1 ）frequency radio waves that travel instraighdine sthroughthe air．Because the waves cannot（ 2 ）with the curvature of the earth，they can be （ 3 ）onlyover short distance．Thus，microwave is a good（ 4 ）for sending data between bulldingsin a city or on a large college campus．For longer distances，the waves must berelayed by means of“dishes”or（ 5 ）．These can be installed on towers，highbuildings，and mountain tops．
第71题：文中（ 1 ）处正确的答案是（ ）。
A．high
B．10w
C．1ong
D．short
微波通信利用在空气中直线传播的高频无线电波通信，因为电磁波不能随着地球表面的曲度而弯曲，所以只能用来在短距离内传输。这样，微波就是一种在大楼之间或在大的大学校园里用来发送数据的优良介质。如果要进行更长距离的传输，电磁波必须通过蝶行卫星天线或普通天线中转。这些天线能够被安装在塔顶、高楼和山顶上。
第4题：
decreases the size of the line
should be used if the line is going through a block
should only be used in wire rope
doubles the size of the line
第5题：
I would be very much________if you could arrange for a radio technician to come on board for my radar repair.
A.obliged
B.obliging
C.oblige
D.being obliged
第6题：
Radar is used not only to look______，but also to measure their distances away from you．
A.at obscured objects
B.forward submerged targets
C.up exposed targets
D.for unseen objects
第7题：
Microwave communication uses high-frequency(56)waves that travel in straightlines through the air. Because the waves cannot(57)with the curvature of the earth, they can be(58)only over short distance. Thus, microwave is a good(59)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(60).These can be installed on towers, high buildings, and mountain tops.
A．optical
B．radio
C．electrical
D．magnetic
第8题：
B
Radio and television are very popular in the world today． Millions of people watch TV．Perhaps more people listen to the radio．The TV is，of course，more useful than the radio． On TV you can see and hear what is hap-pening in the world．Now radio is still with us． And the number of listeners is becoming larger． One reason for this is the invention of the transistor(半导体) radio． A transistor radio is sometimes very small． It is very easy to carry． You can put one in your pocket and listen to it on the bus or on your bike when you go to work． It is better．for blind people． The sight(视力J) of many old peo-ple is not good enough to watch TV． Then，when people are working，they can't watch TV， but they can listen to music or news over the radio． What-s more，radio is much cheaper than TV．
( )26． Radio and television__________ in the modern world today
．
A． are both widely used
B． are both expensive
C． have been changed a lot
D． are used for learning things
第9题：
My radar is not working．I require shorebased radar assistance．Is shorebased radar assistance ________ ？
A.used
B.available
C.in use
D.can be used
第10题：
is used in running rigging
doubles the size of the line
is only used on fiber rope
is very weak