Many of us remember being in awe(敬畏) when we ...

Many of us remember being in awe(敬畏) when we saw cloned dinosaurs running wild in the film Jurassic Park. And the idea of using technology to revive(恢复) extinct species has long fascinated not only writers and directors, but scientists as well.

According to The Telegraph, woolly mammoths(长毛猛犸象), which featured in the popular Ice Age animated movie series, “may walk the earth once more” now that scientists have taken another step toward realizing a long-held dream—recreating their DNA.

Mammoths became extinct around 10,000 years ago. However, since the discovery of near-perfect preserved remains in Arctic permafrost(北极冻土带) in May 2013, a variety of research studies have been carried out since.

Geneticists from Harvard University analyzed DNA from the remains, looking for genes which separated mammoths from elephants, such as hairiness and ear size. They then used the results to reproduce exact copies of 14 mammoth genes. “It is the first time that mammoth genes have been alive—although so far it has only been done in the lab,” George Church, lead researcher of the project, told the Sunday Times.

Church then used a new technique which allows scientists to edit DNA carefully, replacing sections of elephant DNA with the mammoth genes. So “we now have functioning elephant cells with mammoth DNA in them,” he said.

However, Church ruled out the possibility of bringing the mammoths back to life via cloning from frozen remains. He said he “preferred to focus on rebuilding the full mammoth genome(基因组) by analyzing DNA from preserved remains and putting it into the cells of its closest living relative – the Asian elephant,” reported The Telegraph.

Church argued that the return of the woolly mammoth—or rather, the return of something very similar—could help bring back fragile(脆弱的) ecosystems. However, some scientists believe that bringing back the mammoth would be unethical.

Professor Alex Greenwood, an expert on ancient DNA, said: “We may face the extinction of African and Asian elephants. Why bring back another elephant from extinction when we cannot even keep the ones that are not extinct around?” he told the Sunday Times. “What is the message? We can be as irresponsible with the environment as we want. Then we’ll just clone things back?”

“Money would be better spent focusing on conserving what we do have than spending it on an animal that has been extinct for thousands of years,” he said.

1.We can learn from the article that ______.

A. cloned mammoths followed cloned dinosaurs to get revived

B. the technology to revive mammoth genes is already mature

C. George Church and his colleagues tried to reproduce mammoth DNA

D. Church and his team managed to list all the genes that separate mammoths from elephants

2.According to Church, what is the significance of his study?

A. It could help prevent the extinction of the Asian elephant.

B. It could help people better tell elephant DNA from mammoth genes.

C. It could help bring back some extinct species and save fragile ecosystems.

D. It could help bring mammoths back to life via cloning from frozen remains.

3.The underlined word “unethical” in Paragraph 7 is closest in meaning to ______.

A. unacceptable　　 B. misled

C. impractical　　 D. illegal

4.According to the article, Professor Alex Greenwood believes that _______.

A. there is no need to worry about the extinction of African and Asian elephants at present

B. it’s necessary to bring back species that are beneficial to human beings from extinction

C. the return of the woolly mammoth would help to balance ecosystems

D. it’s more important to protect present species than to bring back extinct ones

高一英语阅读理解中等难度题查看答案及解析

We saw a ________ big snake in the grass yesterday, which ________ all of us to death.

A. frightened; frightened               C. frightened; frightening

C. frightening; frightened              D. frightening; frightening

高一英语单项填空中等难度题查看答案及解析

We are taught from childhood to be polite, civilized (有教养的) and considerate (体贴的) , yet many of us forget this as we grow up.

That's not the case for Yang Yang, a 14 - year - old from Changsha, Hunan province. She has moved many people by being honest and considerate. It was a day in April when Yang was getting ready to eat in a local restaurant. But then she accidentally dropped a plate full of food. She stood still and was at a loss. The restaurant manager was nice. She comforted Yang, saying "It doesn't matter. We can give you another meal for free."

Everyone thought that this small matter would end like that. But, when Yang left after eating, the waiter found 75 yuan in cash and a note on the table. The note said, "I'm sorry that the money might not be enough to make up for your loss, but that's all I have. Thank you for your kindness." The manager was deeply touched after reading the note. The money was probably a week's worth of pocket money for the girl.

The manager posted about this on social media and called for a search for this young girl. Many newspapers, including People's Daily, re-posted it and joined the search. Finally, Yang was found after her teacher heard about the story.

However, Yang thought it was not a big deal. "I have accepted other people's help and should make up for their kindness, " she said.

People's Daily commented (评论) on the story, saying that it showed the good in people. The manager was considerate and cared about Yang's situation, while Yang was grateful and responsible.

1.How has Yang Yang moved many people? ______

A.By her age. B.By her hometown.

C.By her honesty and consideration. D.By her dropping a plate.

2.What happened to her when Yang Yang was getting ready to eat? ______

A.She dropped a plate full of food by accident. B.She fell down on the ground.

C.She gave the manager 75 yuan. D.She met her teacher.

3.What did Yang Yang think about the matter? ______

A.She felt very proud. B.She should be praised.

C.She was not satisfied with herself. D.She thought nothing of it.

4.What kind of person is the manager? ______

A.Humorous and warm - hearted. B.Considerate and caring.

C.Strict and hard - working. D.Grateful and responsible.

高一英语阅读理解中等难度题查看答案及解析

Many of us love July because it’s the month when nature’s berries and stone fruits are in abundance. These colourful and sweet jewels form British Columbia’s fields are little powerhouses of nutritional protection.

Of the common berries, strawberries are highest in vitamin C, although, because of their seeds, raspberries contain a little more protein (蛋白质), iron and zinc (not that fruits have much protein). Blueberries are particularly high in antioxidants (抗氧化物质). The yellow and orange stone fruits such as peaches are high in the carotenoids we turn into vitamin A and which are antioxidants. As for cherries (樱桃), they are so delicious who cares? However, they are rich in vitamin C.

When combined with berries of slices of other fruits, frozen bananas make an excellent base for thick, cooling fruit shakes and low fat “ice cream”. For this purpose, select ripe bananas for freezing as they are much sweeter. Remove the skin and place them in plastic bags or containers and freeze. If you like, a squeeze of fresh lemon juice on the bananas will prevent them turning brown. Frozen bananas will last several weeks, depending on their ripeness and the temperature of the freezer.

If you have a juicer, you can simply feed in frozen bananas and some berries or sliced fruit. Out comes a “soft-serve” creamy dessert, to be eaten right away. This makes a fun activity for a children’s party; they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below.

1.What does the author seem to like about cherries?

A. They contain protein.　　 B. They are high in vitamin A.

C. They have a pleasant taste.　　 D. They are rich in antioxidants.

2.Why is fresh lemon juice used in freezing bananas?

A. To make them smell better.　　 B. To keep their colour.

C. To speed up their ripening.　　 D. To improve their nutrition.

3.What is “a juicer” in the last paragraph?

A. A dessert.　　 B. A drink.

C. A container.　　 D. A machine.

4.From which is the text probably taken?

A. A biology textbook.　　 B. A health magazine.

C. A research paper.　　 D. A travel brochure.

高一英语阅读理解中等难度题查看答案及解析

He gave us a lot of help when we were in trouble, but we have nothing to give him ________.

A. in danger            C. in need            C. in return            D. in fact

高一英语单项填空中等难度题查看答案及解析

Many scientists believe our love of sugar may actually be an addiction. When we eat or drink sugary foods, the sugar enters our blood and affects parts of our brain that make us feel good.

1.In this way, it is in fact an addictive drug, one that doctors recommend we all cut down on.

“It seems like every time I study an illness and trace a path to the first cause, I find my way back to sugar,” says scientist Richard Johnson. One-third of adults worldwide have high blood pressure, and up to 347 million have diabetes. Why? “ 2.“ says Johnson.

Our bodies are designed to survive on very little sugar. Early humans often had very little food, so our bodies learned to be very efficient in storing sugar as fat. In this way, we had energy stored for when there was no food. But today, most people have more than enough. 3.

So what is the solution? It’s obvious that we need to eat less sugar. 4.From breakfast cereals to after-dinner desserts, our foods are increasingly filled with it. Some manufacturers even use sugar to replace taste in foods that are advertised as low in fat.

But there are those who are fighting back against sugar. 5.Other schools are growing their own food in gardens, or building facilities like walking tracks so students and others in the community can exercise. The battle has not yet been lost.

A.We take in more energy and fat.

B.Then the good feeling goes away, leaving us wanting more.

C.Our ancestors were used to poor food, clothing and shelter.

D.So the very thing that once saved us, may now be killing us.

E.Sugar, we believe, is one of the reasons, if not the major one.

F.The trouble is, in today's world, it's extremely difficult to avoid.

G.Many schools are replacing sugary desserts with healthier options like fruit.

高一英语七选五中等难度题查看答案及解析

When we talk about paper, we think of newspapers and books. But there is some paper1.(use) in many other ways. Only half of 2. world’s paper is used for books and newspapers. Paper , on 3.we usually write and draw , is very good for keeping you warm. You have perhaps seen homeless men asleep on a large number of newspapers. In Finland, it is sometimes -40° C in winter. The farmers wear paper boots in the snow. Nothing could be4. (warm).

Each year, more and more 5. (thing) are made of paper. We have had paper cups and plates for a long time. But now we hear that chairs, tables, and even beds can 6.(make) of paper. With paper boots and shoes, you can also wear paper hats, paper dresses, and paper raincoats. 7.you have used paper cups once, you throw them away and buy new8.(one).

The latest use of paper seems to be paper houses. These are not small houses for children 9.(play) in, but real, big houses for people to live in. You can buy a house with three rooms for about 500 dollars. You can put it up by yourself in a few hours, 10.you can use it for about five years.

高一英语完形填空困难题查看答案及解析

Many people think of guys as being carefree when it comes to their appearance. But in fact, a lot of guys spend plenty of time in front of the mirror.1.

Body image is a person’s opinions and feelings about his or her own body and physical appearance. 2.You appreciate your body for its abilities and accept its imperfections.

So,what can you do to develop a positive body image? Here are some ideas:

Recognize your strengths. Different body types are good for different things. What does your body do well? Maybe your speed, strength, or coordination (协调) makes you better than others at a certain sport. That may be basketball, table tennis, mountain biking, dancing, or even running. Or perhaps you have skills, like drawing, singing, playing a musical instrument, writing, or acting.3.

Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques (体形) don’t just happen. 4.You can keep healthy by simply exercising 20 minutes to one hour three times a week. Taking exercise can also lift your spirits.

Respect your body! Practising good habits- regular showering; taking care of your teeth, hair, and skin; wearing clean clothes, and so on-can help you build a positive body image.

5.Your body is just one part of who you are. Your talent for humor, a quick wit (智慧), and all the things make you special. So try not to let small imperfections affect you.

A. Use this as an opportunity to discover what you’re good at.

B. Be yourself.

C. They care just as much as girls do about their body image.

D. Just explore talents that you feel good about.

E. They take hard work, regular workouts, and a healthy habit.

F. The good news is that self-image and body image can be changed.

G. Having a positive body image means feeling satisfied with the way you look.

高一英语七选五中等难度题查看答案及解析

Many people think of guys as being carefree when it comes to their appearance. But in fact, a lot of guys spend plenty of time in front of the mirror.　 1..

Body image is a person's opinions and feelings about his or her own body and physical appearance.  2. You appreciate your body for its capabilities and accept its imperfections.

So, what can you do to develop a positive body image? Here are some ideas：

Recognize your strengths. Different body types are good for different things. Maybe your speed, strength makes you better than others at a certain sport. Maybe basketball, table tennis, or even running or perhaps non－sports skills, like drawing, singing, or acting. 3.

Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques (体形) don't just happen. 4. A healthy habit can be as simple as exercising 20 minutes to one hour three days a week. Working out can also lift your spirits.

5. .Your body is just one part of who you are. Your talent for comedy, and all the other things make you unique. So try not to let small imperfections take over.

A．Use this as an opportunity to discover what you're good at.

B．Be yourself.

C．They care just as much as girls do about their body image.

D．Just explore talents that you feel good about.

E．They take hard work, regular workouts, and a healthy diet.

F．The good news is that self－image and body image can be changed.

G．Having a positive body image means feeling satisfied with the way you look.

高一英语七选五中等难度题查看答案及解析

When he saw we were upset, he began to ____ us for hours with his stories and jokes.

高一英语单项填空中等难度题查看答案及解析