當(dāng)前位置：北師大版（2019）必修2《Unit 4 Information technology》2021年單元測試卷（1）> 試題詳情

There have been a lot of comments recently surrounding 5 G，the next generation of wireless technology.（1）
B
B
？How might it change our lives？
   5 G stands for fifth generation，meaning the next step in the progression of technology to replace the current 4 G system.Earlier "G" systems were designed to improve mobile communication operations.Each new technology brought major improvements in speed and greatly increased network capacity（容量）.（2）
D
D
.It is expected to permit more users to do more things at a faster rate.
   However，technology experts say there is a major way that 5 G is different from the earlier systems.（3）
E
E
.It will affect many more devices and industries than other "G" versions.
   5 G will help fuel future "smart cities" by connecting sensor networks.5 G is also expected to connect self-driving cars and support new technologies involving virtual reality（虛擬現(xiàn)實）.Higher 5 G speeds could also permit doctors to commonly perform remote medical operations.Factories and businesses could use 5 G technology to increase automation and improve the collection of information.
   （4）
C
C
.The increased data flow across 5 G networks would give Internet attackers a lot more possibilities to steal and misuse data.In addition，the wider use of a 5 G wireless network means any breakdown of the system would have more widespread and severe results.Such difficulties could affect public safety.（5）
G
G
，or a network breakdown could cause self-driving vehicles to crash.

A.Why is 5 G so popular
B.What is this technology
C.Every coin has two sides
D.The new 5 G system promises more of the same
E.It will move beyond mobile network technology
F.A breakdown of 5 G networks may cause economic losses
G.A failure during a doctor's remote operation could lead to death

【考點】篇章結(jié)構(gòu)．

【答案】B；D；E；C；G

【解答】

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發(fā)布：2024/5/27 14:0:0組卷：3引用：1難度：0.5

相似題

1．Five steps to better handwriting Some kids love handwriting，but others hate when it's time to put their pen to paper.Maybe they are worried about their handwriting.Are you one of them？（1）

Here are five steps that really work!
   Get a correct grasp
   Try this — hold your pencil at the top and try to write your name.Pretty hard？But when you hold your pencil the correct way，writing is much easier.（2）

Hold it in place with your thumb（拇指），and your index（食指） and middle fingers.
   Let the lines be your guide
   Lined paper is your friend!Those lines can help you create letters that are the right size and proportion（均衡）.（3）

Also be sure to fill up the lined space completely.Those capital letters should be from the bottom line to the top one.
   Slow down
   If your writing is hard to read，try slowing down a little.If you rush，it's hard to control where you stop and start your letters.
   Lower the pressure
   （4）

.That makes it harder to make the smooth lines.Try easing up and don't hold the pencil too tightly.
   （5）

   Lots of games require you to write or draw pictures.So even though it's not schoolwork，you're still using the skills you need to control your pen better.

A.So "a" should be half the height of a capital "A".
B.You've been writing since you were a little kid.
C.Some kids press down really hard when they write.
D.The good news is that just about everyone can improve their handwriting.
E.The best way to hold a pen or pencil is to let it rest next to the base of your thumb.
F.Play games.
G.Ask for more advice.
發(fā)布：2024/4/20 14:35:0組卷：26引用：4難度：0.5
解析
2．Secret codes （密碼） keep messages private．Banks，companies，and government agencies use secret codes in doing business，especially when information is sent by computer．
   People have used secret codes for thousands of years．（1）

Code breaking never lags （落后） far behind code making．The science of creating and reading coded messages is called cryptography．
   There are three main types of cryptography．（2）

For example，the first letters of"My elephant eats too many eels"spell out the hidden message"Meet me．"
   （3）

You might represent each letter with a number，for example．Let's number the letters of the alphabet，in order，from 1 to 26．If we substitute a number for each letter，the message"Meet me"would read"13 5 5 20 13 5．"
   A code uses symbols to replace words，phrases，or sentences．To read the message of a real code，you must have a code book．（4）

For example，"bridge"might stand for"meet"and"out"might stand for"me．"The message"Bridge out"would actually mean"Meet me．"（5）

However，it is also hard to keep a code book secret for long．So codes must be changed frequently．

A．It is very hard to break a code without the code book．
B．In any language，some letters are used more than others．
C．Only people who know the keyword can read the message．
D．As long as there have been codes，people have tried to break them．
E．You can hide a message by having the first letters of each word spell it out．
F．With a code book，you might write down words that would stand for other words．
G．Another way to hide a message is to use symbols to stand for specific letters of the alphabet．
發(fā)布：2024/5/27 14:0:0組卷：468引用：10難度：0.9
解析
3．There have been a lot of comments recently surrounding 5 G，the next generation of wireless technology.（1）

？How might it change our lives？
   5 G stands for fifth generation，meaning the next step in the progression of technology to replace the current 4 G system.Earlier "G" systems were designed to improve mobile communication operations.Each new technology brought major improvements in speed and greatly increased network capacity（容量）.（2）

.It is expected to permit more users to do more things at a faster rate.
   However，technology experts say there is a major way that 5 G is different from the earlier systems.（3）

.It will affect many more devices and industries than other "G" versions.
   5 G will help fuel future "smart cities" by connecting sensor networks.5 G is also expected to connect self-driving cars and support new technologies involving virtual reality（虛擬現(xiàn)實）.Higher 5 G speeds could also permit doctors to commonly perform remote medical operations.Factories and businesses could use 5 G technology to increase automation and improve the collection of information.
   （4）

.The increased data flow across 5 G networks would give Internet attackers a lot more possibilities to steal and misuse data.In addition，the wider use of a 5 G wireless network means any breakdown of the system would have more widespread and severe results.Such difficulties could affect public safety.（5）

，or a network breakdown could cause self-driving vehicles to crash.

A.Why is 5 G so popular
B.What is this technology
C.Every coin has two sides
D.The new 5 G system promises more of the same
E.It will move beyond mobile network technology
F.A breakdown of 5 G networks may cause economic losses
G.A failure during a doctor's remote operation could lead to death
發(fā)布：2024/5/27 14:0:0組卷：9引用：1難度：0.5
解析

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