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Imagine the situation. You are driving a car along a desert or on a mountain. You have no idea you are. You passed the last house two hours ago. Then your breaks down. It is night and it is cold. You have no mobile phone. What do you do? Well, next time take a with you. This invention may be able to help you. It is a device(装置) which uses satellites to find the user’s position(位置). It can find your position to within 20 metres. A GPS cannot start your car, but at least you will where you are.
GPS, which means Global Positioning System, is a small receiver. It looks like a mobile phone. You can hold it in your hand, or put in your pocket. It is sometimes put into a watch or a . We also find GPS devices in cars, planes, or boats. Some of these devices have electronic , so you know where you are. For example, in a city they can tell you the name of the .
There are parts to the Global Positioning System. The first part is the . You can either hold it in your hand have it fixed into your car, plane, etc. The second part is a group of satellites orbiting the Earth. The receiver contacts at least four of the satellites and calculates(计算) its position. The third part of the system is a network of ground stations. They are all over the world. They the satellites and make sure they are working well.
Some people think that in the future the GPS will be
as as the mobile. They are
becoming and more and more accurate(精确的). The
re
are also new uses for the GPS. Perhaps they will become like .
Everyone will have one and you will never be lost again.
1.A.where B. what C. who D. how
2.A.ship B. car C. train D. plane
3.A.watch B. ring C. clock D.GPS
4.A.advise B. know C. represent D. speak
5.A.radio B. TV C. robot D. machine
6.A.room B. office C. road D. mobile phone
7.A.parts B. maps C. video D. music
8.A.studio B. teenager C. bus D. street
9.A. five B. four C. three D. two
10.A. sender B. receiver C. Internet D. system
11.A.and B. then C. but D. or
12.A.control B. achieve C. allow D. imagine
13.A.expensive B. special C. new D. common
14.A. cheaper B. easier C. more expensive D. bigger
15.A.computers B. robots C. satellites D. watches
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| Here's a good way to find out where you need the most improvement: check your report card. Don't just look at the 1 . Check the comments your teachers write about each 2 . Very often when students 3 report cards, they check their marks very quickly. Then they stop 4 and put them away. However, this is not right. Your report cards may 5 comments from each teacher. These comments are more useful than the grades. Not all comments by teachers are useful. Some have a common 6 of how the class has studied in the 7 term.There may be only a few 8 on your own work, and sometimes such comments are mainly written about which sometimes teachers' 9 comments are written in a kind of secret code (代码) that I 10 "report-speak". For example, "George has a good understanding of…" It 11 good. But in fact, a "good" understanding may be the third, or fourth best result below "excelent" and "very good". 12 you realize this, "good understanding" isn't so good any more. Because comments on the reportcard don't 13 have the information you're looking for, the 14 way to discover where you most need to improve is to ask your teachers 15 if you want to use your report card better. | ||||
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I don't think it's polite to_______ others when they are talking.
A. advise B. disturb C. hate D. accept
查看习题详情和答案>>—Of course not. I'll do it right away.
B. succeed
C. like
D. mind
soccer, basketball, and baseball. I love sports and really enjoy being part of a team. Playing on our school
sports teams has been the best part of middle school for me. I know I'm lucky that I've had this opportunity.
Some kids have not been so lucky. In fact, many kids who love sports don't have the chance to play on
a school team. That's because, to make a team, you have to try out. The idea is that kids who are good at
sports will do well in tryouts and make the team. But what about the kids who don't do well during tryouts?
Maybe they are ill that clay, or nervous, or are just having a bad day, so they don't play their best. They don't
make the team, and that is too bad.
Also, there are kids who really don't have the skills to play well. They never make a team, and that isn't
fair either. How will kids ever learn the skills if they don't have a chance to play? Remember, this is school
and students are here to learn. All kids should have the chance to learn sports skills and teamwork by playing
on a school sports team.
There are other reasons why every student should have the chance to play sports. Sports are important
for good health and fitness. They help kids feel good about themselves and their school. They build friendships
among teammates. Coaches are good role models, and students who play team sports learn good sportsmanship. And, most important, team sports are fun! Players have fun playing, and their parents have fun watching and
cheering for the team. So, sports bring kids and parents together, too.
By now you know how I feel. Every kid who wants to play on a school sports team should have the
chance. These teams are for fun and fitness-they're not professional teams! Let's change the rules for
making a team. Let's get rid of tryouts. Let's give every student at Central Middle School the chance to
wear a team uniform.
B. Three
C. Four
D. Five
B. hard
C. useful
D. unfair
B. Sports build friendships among teammates.
C. Sports help kids feel good about themselves.
D. Sports are fun and make students study better.
B. tell about exciting moments on sports fields
C. make people believe all kids should play team sports
D. share his opinions of playing team sports with readers