---“Why do you have to be there at six?”---“T...

---“Why do you have to be there at six?”

---“The teacher demands that everyone _____in his seat at six.”

A．would be          B．can be            C．be               D．will be

高二英语单项填空中等难度题查看答案及解析

I wonder why you won't do it as _____. It's the third time you have done so.

A.you told to B.be told C.tell you D.told to

高二英语单项填空困难题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语其他题中等难度题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语阅读理解中等难度题查看答案及解析

---Why do you look so upset?

---There are so many troublesome problems ____.

高二英语单项填空困难题查看答案及解析

---Why do you look so upset?

---There are so many troublesome problems _____.

A．remaining to be settled                   B．remained settled

C．remaining to settle                      D．remained to be settled

高二英语单项填空困难题查看答案及解析

—Do you have anything to say for yourselves?

—Yes，there is one point ________we must insist on.

A.why B.where

C.how D.不填

高二英语单项填空困难题查看答案及解析

There will be days when you do not have much to do. Perhaps because you are waiting for someone else in a different department or a different company to respond to a request. As the clock ticks past 5 pm, there may be no purpose in staying at your desk. But you can see you hard at work and, more important. they can see you. So you make an effort to look busy.

Some of this may he a self-perpetuating(白生自存）cycle. If bosses do not like to go home before their workers, and workers fear leaving before their bosses, everyone is trapped. Staff may feel that they will not get a pay rise, or a promotion, if they are not seen to be putting in maximum effort. This is easily confused with long hours. Managers, who are often no good at judging employees 'performance, use time in the office as an alternative.

The consequence is often wasted effort. Rather than work hard, you work hard to make bosses think that you are. Leaving a jacket on your office chair, walking around purposefully with a notebook or clipboard and sending out emails at odd hours are three of the best-known tricks. After a while this can result in collective self-cheat that this pretence is actual work.

But presenteeism(出勤）has more serious consequences. As well as reducing productivity, this can increase medical expenses for the employer. According to a study, these costs can be six times higher for employers than the costs of absenteeism among workers. To take one example, research published in the British Medical Journal found that Japanese employees with lower-back pain were three times more likely to turn up for work than in Britain. As a result, those workers were more likely to experience greater pain and to suffer from depression. What could be more upset than being in pain while feeling trapped at work?

None of this is to say that employers haven't the right to expect workers to be in the office for an acceptable proportion of time. Unavoidably there will be a need for some(preferably short)meetings. Dealing with colleagues face-to-face creates a feeling of trust and friendship, allows for a useful exchange of ideas and enables workers to have a better sense of their needs.

But modern machinery like smartphones and laptops is portable. It can be used as easily at home as in the office. Turing an office into a prison, with prisoners allowed home for the evenings, does nothing for the creativity that is increasingly demanded of office workers as routine tasks are automated. To be productive you need presence of mind, not being present in the flesh.

1.Why do employees still stay at their desk after work?

A.To keep their bosses company.

B.To get more overtime allowance.

C.To put extra efforts into their work.

D.To give their bosses a good impression.

2.One of the consequences of presenteeism is that___________?

A.employers will pay workers higher wages

B.workers will suffer physically and mentally

C.workers will perform their job more efficiently

D.the effort put in by workers will finally pay off

3.Working in the office for some time can help_________?

A.build better social bonds

B.bring bosses more profits

C.organize a meeting efficiently

D.satisfy workers 'material needs

4.What would the author probably agree with?

A.Presenteeism can't help develop creativity.

B.Absence from work reduces productivity.

C.Presence at work will be more joyful.

D.Technology makes life puzzling.

高二英语阅读理解中等难度题查看答案及解析

I wonder why you didn’t do as ________ and it’s the third time you have done this.

A. telling          B. be told             C. told to         D. tell

高二英语单项填空中等难度题查看答案及解析

Who do you think the teacher will ______ the question?

高二英语单项填空简单题查看答案及解析