The disease is a huge blow for the farmers. H...

The disease is a huge blow for the farmers. Hundreds of them ______ their animals, livelihood and hopes destroyed and many others fear they _____ the same fate.

A. have seen; will suffer　　 B. saw; suffered

C. had seen; was to suffer　　 D. see; suffer

高三英语单项填空中等难度题查看答案及解析

The spread of Internet learning for huge numbers of people is leading some colleges to offer MOOCs, Massive Open Online Courses. Major universities like Stanford in California and Harvard in Massachusetts have invested millions of dollars to help launch MOOCs.

Those schools and others may have heard an attention-getting prediction. The man who created the MOOC service Udacity says that in fifty years, only ten traditional universities will remain in the world. That prediction came from Sebastian Thrun, a computer scientist probably best known for his part in making Google's driverless car. He is still a research professor at Stanford University. But he left his teaching position at Stanford to help start Udacity ,a provider of MOOCs.

Universities that fail to join the movement for MOOCs may be worried about their chances of survival. Colleges also hope to gain more students and cut operational costs in return for their investments.

Moody's Investor Service predicts that MOOCs will help large, famous universities gain more students. It says schools that create content for MOOCs can earn money by providing the course material to smaller schools.

But the investment service is warning that smaller, less well-known colleges may suffer because of MOOCs. It says students may want to receive certificates from major universities instead of attending a local junior college that provides traditional credits.

Recently, the University of Washington said it was the first American university to offer credit for MOOCs, credit that could be used toward a degree from the school.

One criticism of MOOCs has been that most courses being offered are in science, mathematics and technology. But several courses in literature are now available.

Professor Nelson says, "How much MOOCs will change college life is still up in the air. I have been of the opinion which is what universities will evolve to do is to still present some traditional classes, but that universities in some sense will be integrated."

1.Why do some major colleges join in providing MOOCs?

A.To make profits through Internet learning. B.To survive in the Information Age.

C.To offer help to other smaller colleges. D.To attract more investments.

2.What did Sebastian Thrun predict about future college life?

A.Many traditional universities will disappear.

B.Lectures will be given by Al rather than professors.

C.People don't have to receive education.

D.Traditional courses will be entirely replaced by MOOCs.

3.What used to be the disadvantage of MOOCs?

A.They were demanding for students. B.They were not friendly to students of arts.

C.They were not acknowledged by most colleges. D.They were expensive for students to use.

4.What can be inferred from the last paragraph ?

A.More traditional courses will be given in colleges.

B.Students from different universities will study together.

C.The impact of MOOCs on college life is not sure.

D.Professor Nelson is not in favor of MOOCs.

高三英语阅读理解简单题查看答案及解析

AIDS may be one of the most undesirable diseases in the world. Luckily, there is now hope for AIDS patients.

According to a recent paper published in the New England Journal of Medicine，Chinese scientists have successfully used CRISPR technology -a method of gene editing-to treat a patient with HIV. While it may not have cured the patient fully, it still represents a huge step forward in fighting the disease.

The patient was a 27-year-old Chinese man who was diagnosed with both AIDS and acute lymphoblastic leukemia (淋巴母细胞白血病), a type of blood cancer. Despite his bleak situation, doctors offered him a little hope: a bone marrow (骨髓) transplant to treat his cancer and an experimental treatment for his HIV. They used this chance to edit the DNA in bone marrow stem cells (干细胞) from a donor before transplanting the cells into the patient.

Specifically, the treatment involved using the gene-editing tool CRISPR-Cas9 to delete a gene known as CCR5, which encodes (给…编码) a protein that HIV uses to get inside human cells. Without the gene, HIV is unable to enter cells. Talking about the gene, lead scientist Deng Hongkui told CNN, “After being edited, the cells and the blood cells they produce have the ability to resist HIV infection.” Nineteen months after the treatment, the patients leukemia was in complete remission( 缓 解 ) and donor cells without CCR5 remained, according to the research paper.

Though the transplant didn't cure the man’s HIV, it still showed the effectiveness of gene-editing technology, as there was no indication of any unintended genetic changes-a major concern with past gene-editing treatment experiments. Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security in the United States, who was not involved in the study, praised the treatment. “They did a very creative experiment, and it was safe,” he told Live Science. “It should be viewed as a success.”

Deng believes gene-editing technology could “bring a new dawn” to blood related diseases such as AIDS and sickle-cell anaemia ( 镰 状 细 胞 贫 血 ). “Thanks to this new technology, the goal of a functional cure for AIDS is getting closer and closer,” he said.

1.The underlined word “bleak” in Paragraph3 probably means “______”.

A.hopeless

B.unstable

C.embarrassing

D.unique

2.How did the treatment fight against HIV?

A.By identifying and killing HIV.

B.By changing the structure of HIV.

C.By preventing HIV entering cells.

D.By removing a protein HIV feeds on.

3.What is the result of the treatment?

A.Gene-edited cells are able to resist HIV infection.

B.The number of cells infected by HIV has decreased.

C.CCR5 and other genes in the patient's cells are changed.

D.Unintended genetic changes have taken place in the patient's cells.

4.What can we know about the experiment?

A.It pointed out the problems of gene treatment.

B.It provided a new way to cure AIDS patients fully.

C.It could offer a safe treatment for blood-related diseases.

D.It was the first example to use gene-editing tool to treat AIDS.

高三英语阅读理解困难题查看答案及解析

AIDS may be one of the most undesirable diseases in the world. Luckily, there is now hope for AIDS patients. According to a recent paper published in the New England Journal of Medicine, Chinese scientists have successfully used CRISPR technology-a method of gene editing-to treat a patient with HIV. While it may not have cured the patient fully, it still represents a huge step forward in fighting the disease.

The patient was a 27-year-old Chinese man who was diagnosed with both AIDS and acute lymphoblastic leukemia, a type of blood cancer. Despite his bleak situation, doctors offered him a glimmer of hope: a bone marrow (骨髓) transplant to treat his cancer and an experimental treatment for his HIV.

They edited the DNA in bone marrow stem cells from a donor before transplanting the cells into the patient. Specifically, the treatment involved using the gene-editing tool CRISPR-Cas9 to delete a gene known as CCRS, which encodes a protein that HIV uses to get inside human cells. Without the gene, HIV is unable to enter cells. Talking about the gene, lead scientist Deng Hongkui told CNN, “After being edited, the cells-and the blood cells they produce-have the ability to resist HIV infection.” Nineteen months after the treatment, the patient’s leukemia was in complete relief and donor cells without CCR5 remained, according to the research paper.

Though the transplant did not cure the man’s HIV, it still showed the effectiveness of gene-editing technology, as there was no indication of any unintended genetic alterations (改变) -a major concern with past gene therapy experiments.

Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security in the United States, who was not involved in the study, praised the treatment. “They did a very innovative experiment, it was safe,” he told Live Science. “It should be viewed as a success.”

Deng believes gene-editing technology could “bring a new dawn” to blood-related diseases such as AIDS and sickle cell anemia. Thanks to this new technology, “the goal of a functional cure for AIDS is getting closer and closer,” he said.

1.How did the new treatment fight against HIV?

A.By preventing HIV from entering cells. B.By changing the structure of HIV.

C.By removing a protein that HIV feeds on. D.By identifying and killing HIV.

2.What was the result of the treatment?

A.CCR5 and other genes in the patient’s cells were changed.

B.Some of the patient’s blood cells could resist HIV infection.

C.HIV could no longer get into the patient’s cells.

D.The donor cells without CCR5 disappeared finally.

3.What do we know about the experiment?

A.It has provided an innovative way to cure AIDS patients.

B.It pointed out the problems of gene therapy for AIDS.

C.It’s the first experiment to use gene-editing technology to treat AIDS.

D.It could offer a safe treatment for blood-related diseases.

高三英语阅读理解中等难度题查看答案及解析

What is the man thinking about?

A. Food for breakfast.　　 B. The life of a farmer.　　 C. The noise from his neighbors.

高三英语短对话中等难度题查看答案及解析

The soil is becoming poor because farmers here mostly use only one kind of chemical fertilizer for several years________.

A. in a row　　 B. on a large scale

C. at random　　 D. to a degree

高三英语单项填空中等难度题查看答案及解析

25．A heavy drought is hitting the south－west part of China, ______severe problems for hundreds and thousands of people and cattle to get fresh drinking water.

高三英语单项填空简单题查看答案及解析

For many people shopping is considered to be one of the favorite activities. For most of them it is just buying some new clothes or presents for close people. But there is another way for whom shopping is much more than just enjoyable activity, it is a real addiction that in many cases leads to a financial disaster, as well as it brings troubles to person’s life and family.

So why can shopping be so addictive? What are the possible signs to be aware of? And how is it possible to stop the need of spending?

“Some of the new evidence suggests that some people, maybe 10%-15%, may have a genetic preference to an addictive behavior, coupled with an environment in which the particular behavior is caused, but no one really knows why.” However, it is much better understood as to why “shopaholics” continue with their unhealthy and destructive behaviors. Individuals get pleasure from their addiction the same way as if they were under drugs.

And when is it really possible to determine whether simple shopping has crossed the border and has already turned into addiction?

Shopaholics go out and buy things much more often than other people do. They often buy things they do not need. Many shopping addicts go on shopping binges(放纵) all year long and may be forced to buy certain items, such as shoes, clothing or kitchen items. Some just will buy anything. Many times they will spend over their budget limits and get into deep financial trouble, spending well above their income. While someone else will think many times if they can afford this or that thing, shop addicts will not recognize the boundaries of a budget.

1.We can learn from the 3rd paragraph that　　　　 .

A. shopping addiction is mainly caused by genetic factors

B. shopping addicts are also addicted to drugs

C. the real cause of shopping addiction is known already

D. shopaholics can’t control their unhealthy and destructive behaviors

2.The last paragraph is mainly about　　　　 .

A. the destructive behaviors of shopaholics

B. the early signs of shopping addiction

C. the problems of shopaholics

D. the binge of shopaholics

3.What could be most probably discussed in the paragraph to follow the passage?

A. How to treat shopping addiction.

B. What really causes shopping addiction.

C. When shopping addiction takes place.

D. What kind of people can become shopping addicts.

4. It can be inferred from the passage that　　　　 .

A. shopping addiction can’t cause serious problems

B. shopping addicts only want enjoyable activities through buying

C. it’s not a good idea to let a shopping addict pay by credit cards

D. shopping addiction can spread among different people

高三英语阅读理解中等难度题查看答案及解析

The poisonous domoic (藻) acid affected Alfred Hitchcock' s "The Birds" after hundreds of them absorbed the poison in the summer of 1961 and lost their minds.

The sick birds likely consumed poisonous acid via small fish. It also tends to collect in shellfish. And, according to a study published Tuesday, it may become more common as oceans warm, threatening birds and humans alike.

Researchers have studied the rate of poisonous acid over the past 20 years in the Pacific Northwest, and found it strongly related to water temperatures that are warmer than normal.

For now, warmer waters typically comes from events like EL Nino and a decades -long climate cycle called "Pacific decadal oscillation," the study found. It isn't yet clear how climate change, which also warms the oceans, might affect the rate of the poison.

"When water's unusually warm off our coast, it's because the circulation and patterns in the atmosphere has changed, bringing warm water from elsewhere - and this is happening at the same time that we also see high poisonous acid in shellfish, "　 Morgaine McKibben,　 the study ' s lead author said.

The poison is produced during warm domoic blooms, and gets passed up the food chain by animals that eat it.　 Sea lions, dolphins and humans are at risk.　 While some animals can eventually clean themselves of the poison, the threat can last a long time after the warm water decreases.

Animals poisoned by poisonous acid tend to become weak, and experience death. Symptoms in humans include headache, confusion, loss of short - term memory, weakness and unconsciousness.

It isn't just a health risk.　 An Oregon State University statement notes that officials have to shut down shellfish harvests when poisonous acid levels are high, causing economic harm.

Since health officials first regarded poison acid as a health threat in 1987, Pacific Northwest shellfish harvests have been stopped in 2005, 2017, and 2018. The West Coast crab（蟹）industry took an estimated$100 million hit in 2017 alone.

1.Why did the birds lose their mind in the summer of 1961?

A. They maybe had a bad memory. B. They maybe ate poisonous fish.

C. They maybe collected the shellfish. D. They maybe drank warm water.

2.What is the connection between the rate of poisonous acid and water temperatures?

A. When atmosphere has changed, it warms off the coast.

B. When circulation comes, the oceans get warmer.

C. When climate has changed, the oceans get colder.

D. When water becomes warmer, high poisonous acid appears.

3.What result will poisonous acid cause to humans?

A. Making humans conscious. B. Making humans dead.

C. Making humans temporarily lose memory. D. Making humans suffer heart attack.

4.What's the best title of this passage?

A. High Poisonous Acid Appears in the Animals

B. The West Coast Crab Industry Suffer Great Loss

C. Climate Change Warms the Oceans in the World

D. Warmer Oceans Increase Likelihood of Poisonous Shellfish

高三英语阅读理解中等难度题查看答案及解析

In return for the love and care from the parents, we should remember that taking care of them is the ________ responsibility.

A. unshakeable　　　　 B. unbelievable

C. undescribable　　　　 D. unapproachable

高三英语单项填空中等难度题查看答案及解析