People usually turn on the radio to listen to...

People usually turn on the radio to listen to evergreen songs, which _____ them of their past.

高三英语单项填空中等难度题查看答案及解析

Plants do not listen to the radio. But a team of researchers in Greece recently found a way to turn lemons into very small “radio stations” that can broadcast information about their trees’ moisture content to a smartphone—the first step toward creating what the researchers call an “Internet of plants.”

Scientists had previously attached sensors to trees to measure their water use, but “no other team had created a wireless radio network among plants, sending information while consuming only a few microwatts and costing just a few dollars,” says project leader Aggelos Bletsas, a professor of electrical and computer engineering at the Technical University of Crete.

The network consists of several basic components: an existing FM radio station, an antenna (天线) attached to a lemon growing on a tree, a humidity (湿度) sensor in the lemon, a transistor connected to an antenna and an FM receiver. First, the antenna picks up the signal from the FM station, and then passes the signal to the transistor, which is modulated by the humidity sensor. The sensor switches the transistor on and off at a rate dependent on the plant’s moisture level: if the soil is wet or if the atmosphere is humid, that rate is lower; if it is dry, the rate is higher. Finally, the antenna broadcasts this information to the radio receiver on a mobile phone.

In this way, plants can tell farmers if they are thirsty. “We can literally ‘listen’ to the moisture of the plant, using our mobile FM radio with a $3.4 sensor,” Bletsas says. “Two of these sensors for every acre on any given farm might change the way we conduct agriculture and ‘understand’ plants.” He notes that more sensors may be needed for the best possible results. Such real-time information could enable better control of air and soil moisture.

Why go through all this trouble and not just use already common wireless technology, such as Bluetooth? “Not only is our technique less complex, as we are just borrowing signals in the environment,” Bletsas says, but “a Bluetooth-based sensor costs about $25. Our final aim is to launch sensors onto the market costing less than $1.”

“Bletsas and his team are completely changing the way of environmental sensing using very simple equipment and surprisingly little power,” says Alexandros Dimakis, an associate professor of electrical and computer engineering at the University of Texas at Austin, who was not involved in the research. “Their work could be a transformational Internet of Things technology for agriculture and for monitoring the environment.”

Bletsas and his colleagues have already applied for a patent for their innovative technology in America.

1.The radio network created by Greek researchers _________.

A.consumes much energy

B.can be put in a smartphone

C.uses simple technology at low cost

D.broadcasts radio programs to plants

2.What does the underlined word “modulated” in Paragraph 3 mean?

A.Monitored. B.Adjusted.

C.Measured. D.Connected.

3.What is Alexandros Dimakis’ attitude to the “radio network”?

A.Positive. B.Critical.

C.Neutral. D.Doubtful.

4.What is the purpose of the passage?

A.To discuss methods of studying plants.

B.To assess the efficiency of Internet of plants.

C.To stress the importance of keeping soil’s moisture.

D.To introduce a new way of measuring plants’ water use.

高三英语阅读理解中等难度题查看答案及解析

When people want to know about the weather,they usually go to their radios,TVs, newspapers,or to the Internet.However,you can also find many weather signs among wildlife, because of their highly developed senses.Drops in air pressure(压力) produce an effect on small animals in many ways.Mice and deer are good weather indicators.People who spend a lot of time outdoors have observed that,before a storm,field mice come out of their holes and run around.Deer leave high ground and come down from the mountains.

Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways.For example,some birds become irritable(急躁的) and quarrelsome and will fight over a piece of bread.Other birds chirp(叽叽喳喳) and sing just before a storm.It seems they know they won’t get another chance for an hour or two.Birds also seek safe places before a storm.You will sometimes see birds settling in trees or gathering together on a wire close to a building.Pre-storm low pressure makes the air so thin that birds have difficulty flying.

It is unusual to see many birds flying overhead in the summertime,rather than during the periods in the spring or autumn.Watch for other weather signs if you see this.If they fly in the wrong direction,they may be flying ahead of a storm.

By paying closer attention to some important signs in nature,we can become better prepared for any kind of weather.

1.The word “indicators” in Paragraph 1 probably means ______.

A.maps                                  B.services

C.signs                                 D.stations

2.There will be a storm if birds ______.

A.make more noise than usual

B.fly in different directions

C.come down from tall trees

D.share a piece of bread

3.How can birds sense the coming of a storm?

A.By feeling a drop in air temperature.

B.By noticing the change of wind directions.

C.By feeling a drop in air pressure.

D.By noticing the movements of other animals.

4.The best title for the text would be ______.

A.Signs of a Storm

B.Drops in Air Pressure

C.Animals’ Sharp Senses

D.Nature’s Weather Signs

高三英语阅读理解中等难度题查看答案及解析

When people want to know about the weather，they usually go to their radios, TVs, newspapers, or to the Internet. However，you can also find many weather signs among wildlife, because of their highly developed senses. Drops in air pressure (压力) produce an effect on small animals in many ways. Mice and deer are good weather indicators.People who spend a lot of time outdoors have observed that, before a storm, field mice come out of their holes and run around.Deer leave high ground and come down from the mountains.

Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways.For example, some birds become irritable(急躁的) and quarrelsome and will fight over a piece of bread.Other birds chirp (叽叽喳喳) and sing just before a storm.It seems that they know they won't get another chance for an hour or two.Birds also seek safe places before a storm.　 You will sometimes see birds settling in trees or gathering together on a wire close to a building. Pre­storm low pressure makes the air so thin that birds have difficulty flying.

It is unusual to see many birds flying overhead in the summertime，rather than during the periods in the spring or autumn. Watch for other weather signs if you see this.If they fly in the wrong direction, they may be flying ahead of a storm.

By paying closer attention to some important signs in nature，we can become better prepared for any kind of weather.

1.There will be a storm if birds________.

A．make more noise than usual

B．fly in different directions

C．come down from tall trees

D．share a piece of bread

2.How can birds sense the coming of a storm?

A．By feeling a drop in air temperature.

B．By noticing the change of wind directions.

C．By feeling a drop in air pressure.

D．By noticing the movements of other animals.

3.The BEST title for the text would be________.

A．Signs of a Storm　 　　　 B．Drops in Air Pressure

C．Animals' Sharp Senses　 D．Nature's Weather Signs

高三英语阅读理解中等难度题查看答案及解析

Aaron LeMieux loves to hike and often listens to the radio at the same time. While on a 1,500-mile hike 1. _______ the Appalachian Trail, Aaron started thinking about energy. Could the energy his body was creating be used to charge an electronic device? In 2006 Aaron quit his job 2. ________ turned the basement of his home into a laboratory. He then put all his time 3.________ developing the nPower PEG.

PEG means personal energy generator(发电机). 4.________ uses the energy you create while moving to charge a hand-held device. Just put your nPower PEG in your bag, 5.________ fasten it to your leg or bicycle. Then plug your MP3 player, cell phone or digital camera into your nPower PEG’s USA port. LeMieux’s company, Tremont Electric, claims 6. ________ nPower PEG can charge most hand-held electronic devices to 80 percent in one hour.

Since it costs US$149, the nPower PEG won’t appeal to everyone with its price so 7. ________. But for those 8.________ spend a lot of time with electronic devices powered by batteries, it might come in handy.

高三英语单词填空简单题查看答案及解析

Don't make a noise! The latest sports news____on the radio. I want to listen to it.

高三英语单项填空中等难度题查看答案及解析

The news of the Ministry's coming to our school for a visit was  ____  on the radio yesterday.

A. turned out                    B. found out                  C. given out                D. carried out

高三英语简单题查看答案及解析

The news of the mayor’s coming to our school for a visit was ____ on the radio yesterday．

高三英语单项填空中等难度题查看答案及解析

The news of the mayor’s coming to our school for a visit was _______ on the radio yesterday.

A.turned out                                B.found out

C.given out                             D.carried out

高三英语单项填空中等难度题查看答案及解析

The news of the mayor’s coming to our school for a visit was _______ on the radio yesterday.

A. turned out      B. found out       C. given out        D. carried out

高三英语单项填空中等难度题查看答案及解析