阅读理解(七)　科技说明
A　
Air pollution is a big problem for cities in most countries. Many people are dying from it. But how can we tell the air quality is good or bad?
In a tree next to a river in Amsterdam, a tiny birdhouse glows(发光) bright green when the air is clean. If you’re standing nearby, the birdhouse will also give you a free Wi-Fi connection—but only if pollution level is low enough. The designer is Joris Lam. His birdhouse tells you about the air quality.
Joris’ birdhouse is called TreeWifi. It can be put on a tree around your house to test the air quality. People can see a screen with information about the local air quality and how to improve it.
TreeWifi is a simple way for people to know about the air pollution around them. If the birdhouse does not glow, people should care more about the environment. It reminds them to
change their lifestyles. For example, to protect the air, they can ride bikes or just walk instead of driving cars.
“Imagine if trees gave free Wi-Fi, people would plant more trees like crazy. It’s a pity that they only give us the oxygen(氧气) we breathe,” Joris said.
The birdhouse doesn’t work as a home for birds now. Joris and his team are trying to make some changes to it. In the future, they hope birds will live in the birdhouse and the heat of its green light will be used to keep birds warm in winter.
1.What does the underlined word “it” in Paragraph 1 refer to?    (  )
A.The birdhouse.
B.Air quality.
C.Air pollution.
2.People can get a free Wi-Fi connection when     .(  ) 
①people are standing nearby
②the pollution level is low enough
③the air quality is low enough
A.①②        B.②③
C.①③
3.Joris designed afaster怎么读? screen for the birdhouse to     .    (  ) 
A.receive the free Wi-Fi connection
B.protect the birdhouse from the rain
C.show information about the air quality
4.In the future, the birdhouse will also be used     .(  ) 
A.as a home for birds
B.to tell us the weather
C.to give us the oxygen
B　[2020·淄博]
How can cactus(仙人掌) help the world? It can provide a new kind of sustainable fuel(可持续燃料). Nopalimex, a company in Mexico, has made one of the world’s first cactus-powered factories. The idea came to Sosa in Nopalimex when he was looking for ways to save money for his food factory. He now powers his factory with cactus gas(气体). The cost to produce the gas is half the cost of electricity.
Soon, the gas produced by Nopalimex will also be used in cars. Nopalimex’s gas is made by using the prickly pear(刺梨)—a kind of cactus. To make the gas, the prickly pear is mixed together with manure(肥料). Then the mixture produces the gas that can be used as fuel.
Why cactus? Fuel can be made from other plants such as corn, but there are a few reason
s why cactus is a better choice. First, prickly pears need very little water and very little care, and grow well in hot temperatures. Today, these characteristics are key. Also, unlike corn, prickly pears don’t need space that could be used for other food plants. They can grow in areas where many food plants can’t grow. Last, after making gas from prickly pears and manure, their byproducts(副产品) can be used to help grow food.
Scientists still need to do more research on making and using prickly pear gas. As projects like Nopalimex show, we have the possibility to produce more sustainable fuel to power our lives.
1.How can cactus help the world?    (  )
A.By saving farmers’ money.
B.By providing a new kind of sustainable fuel.
C.By taking the place of corn.
D.By producing a lot of electricity and gas.
2.Why does Sosa power his factory with cactus gas?    (  )
A.Because he wants to save money for his food factory.
B.Because he has grown a lot of cactus and corn in his town.
C.Because he wants to be well-known around the world.
D.Because he wants to grow cactus instead of corn.
3.What does the underlined word “mixture” in Paragraph 2 refer to?    (  )
A.The Nopalimex company.
B.The manure.
C.The prickly pear and manure.
D.Cactus.
4.What is Paragraph 3 mainly about?    (  )
A.How cactus is used to produce gas.
B.Where we can grow a lot of cactus.
C.What Nopalimex does with cactus.
D.Why cactus is a better choice to make fuel.
C　[2020·乐山]
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 and the Internet. And 4G made all of these things faster. What’s special about 5G?
5G has a very short delay between 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.

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。