Scientists are trying to develop a special ma...

Scientists are trying to develop a special material, ________ they will make use of in

spacecraft.

A. it B. one     C. that     D. what

高三英语单项填空中等难度题查看答案及解析

Scientists are trying to develop a special material, _______ they will make use of in space.

A. that             B.  what            C.  it           D. one

高三英语简单题查看答案及解析

1.  Scientists are trying to develop a special material, _______ they will make use of in space.

A. it                B. that             C. what         D. one

高三英语单项填空简单题查看答案及解析

Scientists are trying to develop a special material, _______ they will make use of in space.

A. it                B. that             C. what         D. one

高三英语单项填空中等难度题查看答案及解析

The scientists are now trying to discover that use could be _________ such material.

高三英语单项填空简单题查看答案及解析

Scientists are working to develop crop plants that can reduce the amount of water used for agriculture. Almost sixty percent of the world’s freshwater withdrawals from rivers, lakes and other water resources go toward irrigating fields.

Scientists are using biotechnology as well as traditional breeding methods to develop water-saving crops to feed a growing world.

Thomas “Tommy” Carter is a plant scientist in North Carolina. He works for the Agricultural Research Service in the United States Department of Agriculture. He leads Team Drought, a group of researchers at five universities. They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.

Tommy Carter started working on drought-resistant soybeans in 1981. His research has taken him as far as China, where soybeans have been grown for thousands of years.

Farmers in the United States, however, have grown soybeans for only about a century. Tommy Carter says the soybeans they grow are for the most part genetically similar. More differences could better protect crops against climate changes that can reduce production. Those changes include water shortages which could increase from global warming.

The Agriculture Department has a soybean germplasm(胚质) collection, a collection of genetic material passed from one generation to the next. Members of Team Drought studied more than 2,500 examples from the collection.

They looked at ones from the home of soybeans, Asia. They searched for germplasms that could keep plants from weakening and wilting (凋谢)during hot, dry summers in the United States.

Tommy Carter says they found only five. But these slow-wilting lines, he says, produce four to eight bushels（英斗）more than normal soybeans under drought conditions. The yield depends on location and environment.

Scientists are also working on other plants that either use less water or use it better, or both. For example, companies like Monsanto, DuPont and Syngenta have been developing corn with reduced water needs. Monsanto expects to be ready in a few years to market its first corn seeds genetically engineered to resist drought.

1.According to the passage, scientists try to find out how to _______.

A. grow crops with less water

B. increase crop production

C. feed a growing world

D. save the world’s water resource

2.Why did Tommy Carter come to China?

A. He likes traveling.

B. China has a long history.

C. He’s doing research into soybeans.

D. He works for the Agricultural Research Service.

3.What’s inferred from the passage?

A. Climate changes lead to global warming.

B. Water shortages contribute to global warming.

C. Genetically different soybeans need much water to grow.

D. Genetically different soybeans help to fight against damaging climate changes.

4.What do we know about slow-wilting plants talked about in the passage?

A. They yield big profits.

B. They can grow in almost any climate.

C. They seem to be drought-resistant.

D. They need much water for their growth.

高三英语阅读理解中等难度题查看答案及解析

A team of scientists from University of Freiburg in Germany are developing a shoe with a sensor to automatically tie its laces(鞋带)that could be taken off when users click their heels together．

It’s been 26 years since we saw them magically tightening Marty McFly’s Nike boots in the film Back to The Future．

Now，self-tying shoelaces could actually become a reality this year，proving right one of the film’s fantastical predictions for what 2015 would be like．

Engineers have designed a shoe that can automatically lace up，adjusting itself to the shape of your foot．

Simply slip the controller on and pressure sensors will tell the ‘smart shoe’ when your foot is in position，triggering(触发)a tiny motor in the heel that pulls the laces tight.

When you want to take off the shoes，you click your heels together twice and the motor will release a spring(弹簧)in the shoe’s tongue，which loosens the laces enough for you to slip them off．

And the invention doesn’t even need to be plugged in to charge or have its battery replaced because it runs on power generated by the swing of your foot as you walk.

Engineer K1evis Ylli，of the Institute for Micromachining and Information Technology in southern Gemany，said the shoes could help a variety of different people.

“One focus is that it could be used in shoes for elderly people who have mobility problems，”he said．“But it could also work for children，or as a lifestyle product．”．

The design，which is still in a prototype(雏形)stage，cleverly gets the energy of the foot’s swing when opposing magnets in each shoe move past each other. It then uses that power to charge a battery．An hour of walking is enough to tighten the laces once，and it requires no energy to undo the shoes because that relies on the spring alone.

1.Which of the following can be the best title of the text?

A．A fantastical prediction

B．A great invention in Germany

C．A shoe with self-tying laces

D．A popular lifestyle product

2.What can we learn about the shoes?

A．They can automatically take off．

B．They can adjust themselves to your foot．

C．They need to be charged once．

D．They have been in design for 26 years．

3.From the last paragraph we can know ____________．

A．the shoes have been put into use

B．the shoes need power to take off

C．the shoes promise to be popular

D．how the shoes work to produce energy

高三英语阅读理解中等难度题查看答案及解析

A team of scientists from University of Freiburg in Germany are developing a shoe with a sensor to automatically tie its laces(鞋带)that could be taken off when users click their heels together．

It’s been 26 years since we saw them magically tightening Marty McFly’s Nike boots in the film Back to The Future．

Now，self-tying shoelaces could actually become a reality this year，proving right one of the film’s fantastical predictions for what 2015 would be like．

Engineers have designed a shoe that can automatically lace up，adjusting itself to the shape of your foot．

Simply slip the controller on and pressure sensors will tell the ‘smart shoe’ when your foot is in position，triggering(触发)a tiny motor in the heel that pulls the laces tight.

When you want to take off the shoes，you click your heels together twice and the motor will release a spring(弹簧)in the shoe’s tongue，which loosens the laces enough for you to slip them off．

And the invention doesn’t even need to be plugged in to charge or have its battery replaced because it runs on power generated by the swing of your foot as you walk.

Engineer K1evis Ylli，of the Institute for Micromachining and Information Technology in southern Gemany，said the shoes could help a variety of different people.

“One focus is that it could be used in shoes for elderly people who have mobility problems，”he said．“But it could also work for children，or as a lifestyle product．”．

The design，which is still in a prototype(雏形)stage，cleverly gets the energy of the foot’s swing when opposing magnets in each shoe move past each other. It then uses that power to charge a battery．An hour of walking is enough to tighten the laces once，and it requires no energy to undo the shoes because that relies on the spring alone.

1.Which of the following can be the best title of the text?

A．A fantastical prediction

B．A great invention in Germany

C．A shoe with self-tying laces

D．A popular lifestyle product

2.What can we learn about the shoes?

A．They can automatically take off．

B．They can adjust themselves to your foot．

C．They need to be charged once．

D．They have been in design for 26 years．

3.From the last paragraph we can know ____________．

A．the shoes have been put into use

B．the shoes need power to take off

C．the shoes promise to be popular

D．how the shoes work to produce energy

高三英语阅读理解中等难度题查看答案及解析

Scientists are trying to make the deserts into good land again. They want to bring water to the deserts， so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert in time.

Why is more and more land becoming desert？Scientists think that people make deserts. People are doing bad things to the earth.

Some places on the earth don’t get much rain. But they still don’t become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the sun make the earth even drier. Plants do not let the wind blow the dirt away. When a bit of rain falls，the plants hold the water. Without plants，the land can become desert more easily.

1.Deserts ＿＿＿＿＿＿＿＿ .

2.Small green plants are very important to dry places because ＿＿＿＿＿＿.

3.Land is becoming desert little by little because ＿＿＿＿＿＿.

4.After reading this passage， we learn that ＿＿＿＿＿＿＿＿.

高三英语阅读理解中等难度题查看答案及解析

Scientists are trying to save Puerto Rico’s endangered Amazon parrots after Hurricane Maria destroyed the birds’ habitats and food sources(来源).

El Yunque is a large national forest on the eastern part of Puerto Rico. Just two of the 56 wild parrots that once lived there survived Maria, the Category-4 storm that struck Puerto Rico in September 2017. Scientists report other forests have seen great drops in parrot populations as well.

In the 1800s, there were more than a million of the bright green parrots living in the wild in Puerto Rico. By the 1970s, the number was down to just 13 birds after years of forest clearing.

A special program was started in 1972 to help increase the parrot population, which led to the creation of three breeding(繁殖) centers. Just weeks before Hurricane Maria hit, scientists counted 56 wild parrots at El Yunque. That was the highest number in the program’s history. Scientists say that even though several parrots have been born in captivity(笼养) and in the wild since Maria, the species is still in danger.

The Puerto Rican Amazon is the island’s only remaining native parrot. More than 460 of the birds are kept inside the breeding centers at El Yunque and the Rio Abajo forest. Scientists have not released(释放) any of the birds since Hurricane Maria. A third breeding center, in a forest in the western area of Maricao, has not been in operation since the storm.

Scientists are considering whether to catch some of the remaining wild parrots and put them in the same cage as the birds that are set to be released. This way, the captive birds can learn from the wild birds how to survive in the forests. Another consideration is to release some captive parrots in Maricao, which was not as heavily damaged by Maria.

1.Why has the parrot population greatly decreased in the past 200 years?

A. Because of Hurricane Maria.

B. Because of too much hunting.

C. Because of the loss of forests.

D. Because of lack of breeding centers.

2.Which of the following is true about Hurricane Maria?

A. It killed 56 wild parrots at El Yunque.

B. It greatly affected parrots in captivity.

C. It reduced the number of wild parrots.

D. It led to the creation of three breeding centers.

3.What can we infer about Amazon parrots in captivity?

A. They have the highest number in the history.

B. They have been released since Hurricane Maria.

C. They are used to living in the wild.

D. They are larger in number than those in the wild.

4.What is the best title for the text?

A. Scientists Work to Save Puerto Rican Parrots.

B. Amazon Parrots are in Danger of Disappearing.

C. A Special Program Helps Increase the Parrot Population.

D. Hurricane Maria Reduced the Number of Amazon Parrots.

高三英语阅读理解困难题查看答案及解析