完形填空阅读下面短文，从每小题所给的A、B、C三个选项中，选-优题课

Trees are one of the oldest "citizens" of our earth． They keep our air clean，reduce noise pollution，improve water quality and provide food and building materials．

Just like us，trees change a lot as they grow．At 1 to 3 years old，young trees learn how to grow up safely．For example，many trees grow thorns to warn animals not to go near．Most young trees have large，deep green leaves so that they can catch enough sunlight and change it into their food and energy．

When trees are 4 years old， they begin to grow very rapidly and become strong enough to face challenges later in life． At the age of 15， trees become young adults． They grow more slowly and begin to produce flowers and fruit．

It is not until the tree is 20 to 25 years old that it becomes a real adult．The tree reaches its largest size．The adult tree gives us shade，oxygen and natural beauty．It is also a great place for a tree house，or a place for us to read a book， listen to music and so on． If we give the adult tree proper care， it will go on to live healthily for many years．

Gradually， trees begin to grow older and older and even die．At this time， they still have their important place in nature．When a tree becomes hollow or part of it becomes dead， it provides a home for small animals and is a source of food for many other animals．

In many ways， the life of a tree is similar to our own life experience． When we are looking at the life of a tree， we learn that each period of life brings its own form of joy and challenge． Enjoy every minute of the life of the trees and look after the trees!

The（1）　　of a Tree

Something useful	Improve the environment and offer（2）　　and materials for building．
Changes as they（3）	1 ﹣3 years old	Learn ways to grow up（4）　　．	Grow thorns to warn animals．
			Catch enough sunlight with large green leaves．
	4 years old	Grow quickly and become（5）　　．
	（6）　　years old	Grow slowly and produce flowers and fruit．
	20﹣25 years old	Become real（7）　　．	Give people a lot such as oxygen and good places to relax．
			Live longer if people take（8）　　of them properly．
	Grow older or die	Be still（9）　　in nature．
Conclusion	A tree's life is the（10）　　as our life experience in many ways．

China is called the Kingdom of Fans． Fans are everywhere in our daily life．But how much do you know about them？

It is said that fans were first used to cool the air during the Shang Dynasty． At that time， they were made of feathers， bamboo or silk． Some of them were round， while others were square．

Folding paper fans first became popular during the Song Dynasty． There were usually beautiful pictures on the fans．Some were mountains and rivers，others were flowers and animals．Many people， including Su Dongpo，a poet of the Song Dynasty， and Tang Bohu， a scholar of the Song Dynasty， even painted and wrote poems on fans． This made the fans into art works． Many rich and important people liked holding fans．

Today， fans are popular gifts． During the 2008 Beijing Olympic Games，folding fans were given to leaders and officials from other countries， as well as audience members．While they were having their fans to get cool air， they were also experiencing Chinese culture．

（1）The fans were made of different materials except 　　during the Shang Dynasty．

A．	paper
B．	bamboo
C．	silk
D．	feathers

（2）When did folding fans first become popular？　　

A．	The Shang Dynasty．
B．	The Song Dynasty．
C．	Today．
D．	In 2008．

（3）What couldn't people see on fans in the Song Dynasty？　　

A．	Mountains．
B．	Animals．
C．	Flowers．
D．	Audience．

（4）Which of the following is TRUE according to the passage？　　

A．	Fans were first used to cool the air during the Song Dynasty．
B．	Tang Bohu never wrote or painted on fans．
C．	Some fans were round， while others were square during the Shang Dynasty．
D．	Folding fans were only given to leaders and officials from China．

（5）What's the best title of this passage？　　

A．	The Development of Fans
B．	The Shapes of Fans
C．	When Fans Became Popular
D．	How Fans Became Art Works

Sharing Wall

Dear readers，

Where do you usually read books？ Please share your ideas． Thank you!

Reading Club

In a tree．Perhaps it seems a little strange．But for me， it's really a good place．You can listen to the singing of birds and the green leaves around make you peaceful．

David

At home．"East or west，home is the best．" Home is the warmest place in the world．You can lie on the sofa or just sit on the floor．Quietly，you can enjoy reading books like talking with good friends．

Anna

In the reading club． After reading a good book， maybe you can't wait to share it with your friends．It's really amazing to talk about a good book．

Everyone has his own ideas about the book．You can learn more by sharing．

Peter

In a coffee shop．The taste of coffee smells so nice! On sunny days， you can enjoy the sunshine through the window．On rainy days，you can listen to the sound of rain．

Also，you can watch different people pass by．They may walk into your book and become part of it．

Linda

（1）You can most probably see the sharing wall 　　．

A．	in the reading club
B．	at home
C．	in a coffee shop．
D．	in a tree

（2）Who thinks a tree is a good place to read books？　　

A．	Anna．
B．	Linda．
C．	David．
D．	Peter．

（3）Linda likes reading in a coffee shop because she can 　　．

A．	listen to the singing of birds
B．	enjoy the sunshine or the sound of rain
C．	talk about good books after reading them
D．	lie on the sofa or sit on the floor

（4）Which of the following is NOT mentioned？　　

A．	Peter thinks he can learn more by sharing a good book．
B．	Anna enjoys reading at home．
C．	David thinks a library is the best place to read books．
D．	Home is the warmest place in the world．

（5）The passage is mainly about 　　．

A．	where to borrow books
B．	how to share books
C．	how to make friends
D．	where to read books

A． Try to walk， cycle or drive to your office instead．

B． What steps of prevention（预防） and control are needed？

C． Do not stand face to face with people while waiting．

D． Open windows to let fresh air in during the day．

E． Wash hands in time．

COVID﹣19（新冠病毒） has stopped people from working for several months． In recent days，many people have returned to work．（1）　　Here is some advice．

When commuting（通勤）

Avoid taking public transport．（2）　　If you have to take public transport，you shall wear a face mask（口罩）through the ride and try to avoid touching objects in the vehicles（车辆）with your hands．

Entering the workplace

Wear a face mask and receive body temperature check before entering the office building．You must pass the body temperature check before being allowed in．（3）　　If you have signs such as fever， please go to the fever office of a hospital at once．

Using a lift

Avoid using the lift if you are going to or leaving lower floors． Use the stairs instead． Stand clear of lift doors while waiting．（4）　　

In offices

（5）　　Do it three times a day for 15 minutes to half an hour each time． You can only get infected（感染的） if the virus builds up in large numbers． Fresh air can stop the virus from building up．

Keep healthy habits such as eating a healthy diet， exercising and getting enough sleep． They can improve your immunity（免疫力）．

Do you know 5G？ It is the fifth generation （代） of mobile network technology． These new networks are coming．

China just issued commercial licenses （发放商用牌照）for 5G on June 6， 2019． This means that China's telecom companies will be able to offer 5G networks for mobile phone users．

Each mobile network generation is faster and more powerful than the one before it． 1G let us talk to each other． 2G let us send messages． 3G gave us data（数据） and the Internet． And 4G made all of these things faster． What's special about 5G？

5G has a very short delaybetween sending and receiving information． Now， 4G takes about 100 to 200 milliseconds（毫秒） to send and receive data． But 5G will get it down to 1 millisecond or less ﹣this is almost real﹣time．

This big change will not only make our mobile Internet faster， but also deeply change our lives．Read on to find out how．

5G + entertainment（娱乐）

5G networks are about 100 times faster than 4G． This means you can download a movie in seconds using 5G．

Also， virtual reality（VR） games will become more popular with 5G． The short delay of 5G will make the games feel even more real．

5G + transport

5G will also bring us safer self﹣driving cars． These cars can send signals（信号）to each other．They also talk to traffic lights and road sensors（传感器）． 5G will allow cars to react（反应）even faster than human drivers．

5G + smart homes

5G also makes the Internet of things possible． Internet of things is a large network that connects everything to the Internet． Smart homes are part of it．

For example，your toaster can automatically（自动地） start making breakfast after your alarm rings．And if its sensor feels the air becoming dry， a smart sprinkler（洒水器） could water your plants by itself．

（1）What's the writer's purpose in writing the third paragraph？　　

A．	To explain 5G is the best of all．	B．
C．	To share his knowledge about 5	D．
E．	To encourage people to use the new network technology．	F．
G．	To show the development of mobile network technology．	H．

（2）What does the underlined word "delay" in paragraph 4 mean in Chinese？　　

A．	卡顿
B．	延时
C．	暂停
D．	掉线

（3）Which of the following ways is not mentioned that 5G will change people's lives？　　

A．	Health care．
B．	Entertainment．
C．	Transport．
D．	Smart homes．

（4）What will people do possibly with 5G according to the passage？　　

A．	Download a movie in minutes．
B．	Put everything onto the Internet．
C．	Make self﹣driving cars safer．
D．	Make food more easily and faster．

（5）What's the main idea of the passage？　　

A．	5G will change our lives in many ways．
B．	Mobile networks are changing for better．
C．	5G will make the Internet of things possible．
D．	5G networks for mobile phone users are coming．