(2014·烟台市第二次诊断)Vitamin D helps our bodies mak...

(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.

A．in turn　    B．in particular

C．in advance　    D．in short

高三英语单项填空中等难度题查看答案及解析

Vitamin D helps our bodies make a special chemical，and this special chemical, ______

affects our brains，making us feel happy．

A．in turn          B．in particular         C．in advance         D．in short

高三英语单项填空简单题查看答案及解析

Vitamin D helps our bodies make a special chemical，and this special chemical，

__________，affects our brains，making us feel happy.

A. in turn            B. in particular         C. in advance    D. in short

高三英语单项填空中等难度题查看答案及解析

Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.

高三英语单项填空中等难度题查看答案及解析

We each have a unique genetic(基因的, 遗传的)make-up. Every cell of our body has the same set of about 100, 000 separate genes made of DNA. These are the instructions for producing a person. Genes decide everything from the colour of our skin to the way our brain works. We have one of several billion combinations of DNA which come from the random mixing of our parents’ genes. Except for identical twins(同卵双胞胎), no one has the same combination as another person. We are unique! We are unique in another way, too: in the way we are raised and all the experiences we have from before birth to adult life. These experiences influence us, our behaviour and attitudes, and the choices we make.

But are genes or life experiences more important in shaping our appearance and personality?　 Scientists are studying twins to find out. One set of twins occurs every 70 births—some are identical and others are non-identical twins. Identical twins are special because they share exactly the same genes and often the same environment. Non-identical twins are more like ordinary brothers and sisters.

Some identical twins have been adopted and brought up in different homes. With identical genes but a different home environment, scientists can study twins to see how much a particular feature depends on the genes we inherit(继承). For example, we know that eye problems, like short-sightedness, are mostly genetic. But resistance to pain is largely dependent on experiences. Genes also influence our eating habits. Identical twins brought up apart often like to eat at the same time of day and feel full after eating the same amount. Non-identical twins in similar circumstances have more varied eating habits. Identical twins are also more likely to follow the same patterns for marriage and divorce than non-identical twins.

Scientists are trying to identify the different genes that influence our behavior. Some people are thrill-seekers and get into risk-taking and adventurous activities. They take up extreme sports like bungee jumping and possibly take drugs. Scientists have discovered a gene which affects this.

We could ask, “Are our lives determined by our genes or our upbringing?　 ”Scientists are learning more all the time, but it is certainly true that both are important in making us who we are.

1.What is the main idea of the first paragraph?

A. Both our genes and our experiences make us who we are.

B. How we turn out depends on our parents’ genes.

C. Everyone has a physical double somewhere in the world.

D. We cannot easily change our physical appearance.

2.Why are scientists studying twins?

A. To find out how many twins are born every year.

B. To discover what shapes us as individuals.

C. To compare differences between twins.

D. To study brother-and-sister relationships.

3. According to the passage,　　　　　　　 .

A. one in 70 twins are genetically identical

B. non-identical twins are usually not of the same sex

C. twins separated at birth behave exactly the same

D. identical twins are genetically the same

4.What does the underlined word “this” in Paragraph 4 refer to?

A. Our love of sports.　　　　　　 B. Our attitude to risk-taking.

C. Our skill at bungee jumping.　　 D. Our ability to take drugs.

高三英语阅读理解中等难度题查看答案及解析

Vitamin D helps bones and muscles grow strong and healthy．Low levels of vitamin D can lead to diseases such as rickets(软骨病), mainly found in children．The thinning of bone is a common problem as people, especially women, get older．

But more and more research is suggesting that vitamin D might also help prevent many diseases．The easiest way to get vitamin D is from sunlight．The sun’s ultraviolet(紫外线的)rays react with skin cells to produce vitamin D．But many people worry about getting skin cancer and skin damage from the sun．As a result they stay out of the sun．Also, darker-skinned people produce less vitamin D than lighter-skinned people．The amount also de-creases in older people and those living in northern areas that get less sunlight．

Not many foods naturally contain vitamin D．Foods high in this vitamin include oily fish and fish liver oils．Farmed fish have only about one-fourth as much vitamin D as wild fish．Small amounts of vitamin D are found in beef liver, cheese and egg yolks．But most of the vitamin D in the American diet comes from foods such as milk．

Research in the last several years has shown that low levels of vitamin D may increase the risk of heart attacks in men and deaths from some cancers．More doctors are now having their patients tested for their vitamin D levels．But as research continues, some experts worry that if people take too much vitamin D, it might act as a poison, Also, skin doctors warn people be careful with sun exposures because of the risk of skin cancer．

1.The first paragraph is mainly about________．

A．the muscle diseases                        B．the sources of vitamins

C．the importance of health                    D．the functions of vitamin D

2.Which of the following people produce the least amount of vitamin D?

A．Elderly darker-skinned people．

B．Young lighter-skinned people．

C．Elderly lighter-skinned people．

D．Young darker-skinned people．

3.People can get the most vitamin D from________．

A．beef liver           B．cheese               C．wild fish           D．farmed fish

4.What can we infer from the text?

A．Being exposed to sunlight is the safest way to get vitamin D

B．Lack of vitamin D can make people age quickly

C．Proper vitamin D levels people need are still not determined now．

D．The vitamin D level is higher in men than in women．

高三英语阅读理解中等难度题查看答案及解析

(2013·河南豫西五校高三质检)The text is too difficult. The explanation of our teacher will help make it easy ________.

A．to understand　     B．to be understood

C．understood　     D．understanding

高三英语单项填空中等难度题查看答案及解析

From National to International

Do you have what it takes!

It’s our job to help you make that leap?

The world is waiting. Are you ready?

Is your small business ready to make that next step and expand abroad? A recent survey estimates that up to 40% of all small businesses are intending to do just that. Is your business making up this 40%? Making that move and expanding onto the international market require a different approach from the one you’re used to. On a national level, it is often enough to sell the right product at the right price. Failure to adopt a different sales approach on the international market can often lead to failure as international customers expect different things. This is why we come in. The right knowledge and the right preparation can make all the difference on the international level.

The main aspects of the program we offer are:

1. How can weaknesses be identified and reduced?

2. How are cultural differences handled in the business world?

3. In-depth knowledge of district law, how does it help?

4. How can we target the right kind of international customers and how can we finance this bigger, more complicated international operation?

5. What can be done to create a foolproof (万无一失的) business plan?

Cost of the course: $2, 000 per person. If 4 or more people apply from the same company, then discounts can be arranged. Course times can be changed to accommodate your employees’ schedule. Most importantly, this course is fully accredited by some top level colleges and universities.

1.Who will most likely benefit from this course?

A. Anybody not interested in business administration.

B. A small international business manager.

C. An individual running a small company.

D. Any owner of an international business hoping to go domestic.

2.Why is there a danger of an international business failure?

A. The price of shipping is too high.

B. It takes too long to deliver products.

C. International customers do not speak the same language.

D. The business owner cannot understand the local market.

3.What is NOT listed in the advertised program?

A. How to pay the international workforce.

B. The right way to study international law.

C. Cultural diversities that must be known exactly.

D. What we should learn from our weaknesses.

4.What is the main advantage of participating in this study program?

A. International travel.

B. Fixed schedule for the employees.

C. The availability of discounts of 40%.

D. Credits that can be transferred to university courses.

高三英语阅读理解困难题查看答案及解析

(2013·河南豫西五校质量检测)The text is too difficult. The explanation of our teacher will help make it easy ________.

A．to understand 　　　　　　　　　　　　 B．to be understood

C．understood　 　　　　　　　　　　　　　　 D．understanding

高三英语单项填空中等难度题查看答案及解析

Now, to help creativity grow, we must first make sure we can ______ways and ideas different from our own.

高三英语单项填空简单题查看答案及解析