---Look at the glasses on the desk．Are they D...

---Look at the glasses on the desk．Are they David’s?

---They 　　 belong to him．I saw him go out with glasses just now．

A．might　　　　　　　 B．could　　　　　　 C．mustn’t　　　　 　 D．can’t

高三英语单项填空简单题查看答案及解析

– Look! What are those boys doing ______ the table?

---Well, they are playing cards.

高三英语单项填空中等难度题查看答案及解析

Look closely at ,your hands-are they clean? It doesn't matter how many times you was  your hands. They're still crowded with microbes, which are also called "germs" or "bacteria". Microbes are everywhere. But don't worry-most microbes don't harm you. and many actually help you stay alive.

Now,  scientists say the microbes that live on our hands could be used in a surprising way: fighting crime.

When police visit the scene of a crime, they often look for fingerprints to try to identifythe criminal.  But according to a recent study, investigators could even use microbes to help break a criminal case.

Every person has his or her own set of microbes that live on their hands, according to scientists at,the University of:Colorado. That means the mix of different kinds of microbes on everybody's hand is unique-much like one's fingerprint.

The scientists wanted to know whether this microbe mix could be used as a new kind of fingerprint-especially in a crime scene where fingerprints might be hard to find.  And policemen use forensics such as studying fingerprints to identify the criminal.

"Microbe fingerprints are harder to hide," said Noah Fierer, one of the scientists.

"You can't sterilize(为……杀菌) a surface just by wiping it off. "

His team compared the bacteria on the hands of 273 people with the bacteria found on each person's computer keyboard. For the study, the keyboards had been used only by the people who were being tested. The study showed that the mix of microbes from each per- son's hands matched the mix of microbes on that person's keyboard. The scientists were easily able to tell the 273 people apart-just by looking at their keyboards.

But there are a lot more than 273 criminals. Other scientists wonder whetherthe microbe fingerprint can really be that useful.

Fierer agrees that scientists have a lot more work to do before the microbe fingerprint will be a useful tool．

1.According to the passage,  microbes on people's hands_____

A．do more harm than good                 B．are easy to get rid of

C．are almost the same                     D．might help find crimes

2.The underlined word "forensics" in Paragraph 5 probably refers to________.

A．the scientific test used by police

B．a new kind of fingerprint

C．a kind of bacteria'in people's hands

D．a kind of newly invented keyboard

3.What did Fierer's team find through the study?

A．They found the criminal among the 237 people.

B．They could tell who had used which computer.

C．Computer keyboards couldn't keep people's microbe fingerprints.

D．People's characters could be identified by the keyboards they used.

4.We can learn from the passage that ______.

A．your microbes may give you away

B．scientists will come to a clear conclusion soon

C．many scientists think microbe fingerprints useless

D．the microbe fingerprint has been used in many cases

5.The main idea of the passage is about_____.

A．the importance of fingerprints             B．how to clean our hands

C．the usefulness of microbes                D．different germs on our hands

高三英语阅读理解中等难度题查看答案及解析

语法填空

Look at the round cakes．They are made by Siew Boon．She is a jelly artist 1. runs her own business．She has created beautiful 3D jelly cakes by 2.（use）seaweed jelly and natural coloring．

Siew Boon 3.（begin）her business more than two years ago．In late 2017，unfortunately，doctors found a cancer on her breast．However，she was determined not to let cancer get in the way of her doing 4. she loved．On the days when she was feeling 5.（well），she spent time creating 3D jelly cakes for her team of doctors and carers．

During her fight with breast cancer，focusing on creating beautiful 3D jelly cakes helped to turn her focus away 6. the physical pain and negative thoughts．Moving forward，she hopes to find 7.（way）to make it a meaningful career．

Every piece is created upside down and takes up to 4 hours to complete．The flowers are made with special tools．It takes a lot of creativity and 8.（patient）to create every piece．

Aside from being beautiful，the cakes are special in taste．They have a 9.（vary）of unique tastes，such as flavors of apples，lemons，peaches and roses．

Siew Boon thinks the most 10.（satisfy）part of her job is to be able to bring joy to others．

高三英语语法填空中等难度题查看答案及解析

45. The twins look much like each other, but they are different _____ nature.

高三英语单项填空简单题查看答案及解析

They make a guest appearance in at least half of the articles on Medical News Today. They are responsible for many of the biggest breakthroughs in medicine. However, the humble lab mice also shoulder much of the blame when the failure of drugs to translate from animal models to humans keeps worrying the whole of medical research. Should scientists abandon lab mice altogether?

Mice were introduced into the lab back in the 1920s. An ambitious young American geneticist Clarence Cook Little strongly believed that cancer was an inheritable (有遗传性的) disease, and that mice were the ideal subjects for his experiments.

Other animals were, and still are, used to study disease. Cats and dogs are popular, as well as chimpanzees. Of course, ethical (伦理的) considerations get more complicated the further up the food chain you go. And mice are in sufficient numbers for researchers to conduct thousands of trials. Add to that the problem of cost: A standard lab mouse costs about $20---far cheaper than a healthy cat or dog. So their importance in scientific research has become well-established.

We share more than 97 percent of our working DNA with mice, a consequence of a shared ancestor 75 million years ago. This similarity has been both a blessing and a curse. While we share many basic biological processes, it is the three percent of the genes which set us apart from mice that can have a big influence on how our bodies work.

Mice may not always be the perfect model for understanding our own bodies, but they do hold real value to researchers. Their usefulness will only increase as scientists work out better ways to modify (修改) their genes to compensate for their shortcomings. The difficult part of the issue may be that researchers need to be more critical as they evaluate the type of model that is best for their experiment.

In the end, the story of scientists’ relationship with lab mice will possibly be one of gradual advances to improve an imperfect system. This is exactly how most scientific research progresses — by critically examining what we know to expand our knowledge of what we do not.

1.What does the underlined word “they” in the first paragraph refer to?

A.American geneticists B.cats and dogs

C.lab mice D.breakthroughs in medicine

2.Paragraph 4 mainly answers the question “________?”

A.Why do drugs that work in mice fail when tried in humans

B.Why are mice the ideal subjects for medical research

C.Why do we and mice share more than 97% of our working DNA

D.How can we understand our own bodies by studying lab mice

3.Which of the following statements is TRUE according to the passage?

A.Mice are in sufficient numbers because they are at the lower part of the food chain.

B.Many scientist are considering stopping the use of lab mice.

C.More genetically modified mice will be used in medical research in the near future.

D.It will become easier for researchers to choose the proper type of lab mice.

4.What is the author’s attitude to the use of lab mice?

A.Disappointed B.Supportive

C.Indifferent D.disapproving

高三英语阅读理解中等难度题查看答案及解析

.Part of the family _______ out on holiday. They are supposed to be back at the end of this week.

高三英语单项填空中等难度题查看答案及解析

______ they are brothers, they don't look like each other at all.

高三英语单项填空简单题查看答案及解析

________ she was out of the room, he took a quick look at the papers on her desk.

A. If  B. While    C. Though D. Unless

高三英语单项填空中等难度题查看答案及解析

—Put these glasses away before they　　　　　　 ．

—OK．I'll put them in the cupboard．

A．have broken　　     B．are breaking　　　　         C．will be broken         D．get broken

高三英语单项填空中等难度题查看答案及解析