Despite the previous rounds of talks, no agre...

Despite the previous rounds of talks, no agreement______ so far by the two sides.

A. has been reached　　 　　　　　 　 B. was reached

C. will reach　　　 　　　　　　　　　 D. will have reached

高三英语单项填空中等难度题查看答案及解析

Despite the previous rounds of talks, no agreement______ so far by the two sides.

A. has been reached　　　　 B. was reached

C. will reach　　　 　　　　 D. will have reached

高三英语单项填空简单题查看答案及解析

With several rounds of talks, the union leaders successfully ________ an agreement for a shorter working week.

A. deserved                       B. negotiated                     C. persuaded                     D. demanded

高三英语单项填空中等难度题查看答案及解析

From talking robots and video phones, technology has become so advanced that the previously impossible seems to occur on a daily basis. And yet—we still have no cure for the common cold.

Why can’t we stop the common cold? According to Peter Barlow, a scientist at Edinburgh Napier University, the main challenge lies in the many different types of cold viruses that are produced by the rhinoviruses (鼻病毒). There are at least 160 types. They change so easily that they quickly become resistant to drugs. In other words, a single cure isn’t likely to work on every type of cold.

However, researchers from Stanford University have found a possible answer. They discovered a protein that the viruses need. Without it, they can't spread inside your body.

To identify the gene which produces the specific protein needed by the viruses, researchers used a gene-editing technique to test all genes one by one for thousands of cells. These modified (改变的) cells were then exposed to a range of rhinoviruses which cause the common cold.

All the viruses were unable to copy inside cells without a gene that produces a specific protein, called methyltransferase (甲基转移酶) SETD3.

Then, they tested genetically modified mice, which were completely unable to produce the protein. The mice were able to live healthy, normal lives without the protein.

“Lacking that gene protected the mice completely from the common cold,”　 associate professor Jan Carette, from Stanford, told the BBC.

“These mice would always die, but they survived and we saw a very strong protection.”

Carette said the plan is to find a drug which can keep back the protein for a limited time, rather than produce genetically modified humans.

“We have identified a fantastic target that all rhinoviruses require and depend on. Take that away and the virus really has no chance,” said Carette.

1.Why does the author mention talking robots and video phones in the first paragraph?

A.To stress the importance of technology.

B.To encourage readers to share their ideas.

C.To introduce the topic of the text.

D.To recognize the progress of science.

2.What can we learn about the protein needed by the viruses?

A.It helps the viruses copy inside our bodies.

B.It stops the viruses from changing easily.

C.It protects the viruses against drugs.

D.It forces the viruses to spread fast.

3.What does Jan Carette intend to do?

A.To identify a fantastic target.

B.To slow copying speed of some genes.

C.To produce genetically modified humans.

D.To find a drug to temporarily block the protein.

4.What is the best title for the text?

A.A New Experiment on Viruses.

B.New Defense Found for Viruses.

C.A Chemical Curing Modified Viruses.

D.Gene-editing Technology to Control Viruses.

高三英语阅读理解困难题查看答案及解析

From talking robots to driverless vehicles, technology has become so advanced that the previously impossible seems to occur on a daily basis. And yet-we still have no cure for the common cold.

Why can't we stop the common cold? According to Peter Barlow, a scientist at Edinburgh Napier University, the main challenge lies in the many different types of cold viruses that belong to the rhinoviruses(鼻病毒). There are at least 160 types.They mutate(突变) so easily that they quickly become resistant to drugs, or learn to hide from our immune systems. In other words, a single cure isn't likely to work on every type of cold.

However, researchers from Stanford University and the University of California, San Francisco, have found a possible answer. They discovered a protein(蛋白质) that the viruses need. All the viruses were unable to replicate(复制) inside cells without a gene that produces a specific protein called SETD3.

To identify the gene which produces the specific protein, researchers used a gene-editing technique to test all genes in the human genome (基因组). Namely, they randomly disabled a single gene in each of the cells, so that the cells lacked one or another of every gene in our genome. These genetically modified cells were then exposed to the rhinoviruses, which cause the common cold. The team then looked at which gene was missing in cells that continued to grow. As it turned out, the one that stood out was SETD3, which makes a protein of the same name.

Carette said the plan is to find a drug which can temporarily disable the protein, instead of producing genetically modified humans. “We have identified a fantastic target that all rhinoviruses require and depend on. Take that away and the virus really has no chance,” said Carette.

1.Which does Peter Barlow think is a problem for fighting the common cold?

A.The poor immunity of patients. B.The large variety of viruses.

C.The lack of enough cures. D.The side effects of drugs.

2.What do we know about the gene-editing study in Paragraph 4?

A.All genetically modified cells survived B.Some genes in our genome were ignored

C.It located the gene responsible for SETD3 D.It exposed the harm of the rhinoviruses.

3.How should we stay away from the common cold according to Carette?

A.Apply gene-editing to human genes B.Avoid contacts with colds patients

C.Prevent cold viruses from mutating D.Develop a drug to switch off SETD3

4.Which of the following is the best title for the text?

A.Potential defense found for cold viruses B.Secrets behind the human genes

C.Real causes of the common cold D.Puzzles over rhinoviruses solved

高三英语阅读理解中等难度题查看答案及解析

News reports say peace talks between the two countries________with no agreement reached.

高三英语单项填空中等难度题查看答案及解析

News reports say peace talks between the two counties have________ with no agreement reached.

高三英语单项填空简单题查看答案及解析

News report say peace talks between the two countries _________with no agreement reached.

A. have broken down   B. have broken out   C.have broken in    D. have broken up

高三英语单项填空中等难度题查看答案及解析

With so many children ____round the table, the food disappeared_______．

A．seating, at no time              B．seated, in no time

C．seated, at no time               D．seating, in no time

高三英语单项填空中等难度题查看答案及解析

With so many children ____round the table, the food disappeared_______．

高三英语单项填空简单题查看答案及解析