甾体母核C侧链分别为

C甾属于( )

A:2个碳原子 B:9~10个碳原子脂肪烃 C:戊酸 D:含氧功能基 E:21个碳原子

维生素C注射液中各成分的作用

维生素C

A:pH调节剂 B:抗氧剂 C:金属络合剂 D:溶剂 E:主药

第4篇 Trying to Find a Partner One of the most striking findings of a recent poll in the UK is that of the people interviewed, one in two believes that it is becoming more difficult to meet someone to start a family with. Why are many finding it increasingly difficult to start and sustain intimate relationships Does modern life really make it harder to fall in love Or are we making it harder for ourselves It is certainly the case today that contemporary couples benefit in different ways from relationships. Women no longer rely upon partners for economic security or status. A man doesn’t expect his spouse to be in sole charge of running his household and raising his children. But perhaps the knowledge that we can live perfectly well without a partnership means that it takes much more to persuade people to abandon their independence. In theory, finding a partner should be much simpler these days. Only a few generations ago, your choice of soulmate (心上人) was constrained by geography, social convention and family tradition. Although it was never explicit, many marriages were essentially arranged. Now those barriers have been broken down. You can approach a builder or a brain surgeon in any bar in any city on any given evening. When the world is your oyster (牡蛎) ,you surely have a better chance of finding a pearl. But it seems that the old conventions have been replaced by an even tighter constraint: the tyranny of choice. The expectations of partners are inflated to an unmanageable degree, good looks, impressive salary, kind to grandmother, and right socks. There is no room for error in the first impression. We think that a relationship can be perfect. If it isn’t, it is disposable. We work to protect ourselves against future heartache and don’t put in the hard emotional labor needed to build a strong relationship. Of course, this is complicated by realities. The cost of housing and child-rearing creates pressure to have a stable income and career before a life partnership.Which of the following is NOT expected of a partner according to this passage

A:Good looks. B:An impressive career. C:A high salary. D:A fine sense of humor.

Human beings are animals. We breathe, eat and digest, and reproduce the same life (1) common to all animals. In a biological laboratory, rats, monkeys, and humans seem very much the same.
However, biological understanding is not enough: (2) itself, it can never tell us what human beings are. (3) to our physical equipment--the naked human body--we are not an (4) animal. We are tropical creatures, (5) hairless and sensitive to cold. We are not fast and have neither claws nor sharp teeth to defend ourselves.We need a lot of food but have almost no physical equipment to help us get it. In the purely physical (6) , our species seems a poor (7) for survival.
But we have survived--survived and multiplied and (8) the earth. Some day we will have a (9) living on the moon, a place with neither air nor water and with temperatures that mm gases into solids. How can we have done all these things. Part of the answer is physical.
(10) its limitations, our physical equipment has some important (11) . We have excellent vision and hands that can (12) objects with a precision unmatched by any other (13) Most importantly, we have a large brain with an almost (14) number of neural (15) .
We have used this physical equipment to create culture, the key to our survival and success. If we live in the Arctic, we supply the warmth for our tropical bodies need (16) clothing, shelter, and (17) heat. If a million people want to live in a desert that supplies natural food for only a few hundred, we find water to grow food and (18) deficits by transporting supplies from distant places. Inhabitants of our eventual moon colony will bring their own food and oxygen and then create an artificial earth environment to supply necessities. With culture, we can overcome our natural limitations.
It was not always (19) Our distant ancestors were just animals, faced with the limits of their physical equipment. They had no (20) and lacked the physical Capacity to use it.

Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or Don ANSWER SHEET 1.13（）

A:intelligent B:impressive C:influential D:incentive

One of the basic characteristics of capitalism is the private ownership of the major means of production— capital. The ownership of large amounts of capital can bring (1) profits, as well as economic and political power. Some recent theorists, (2) , have argued that our society has moved to a new stage of (3) that they call "postindustrial" society. One important change in such a society is that the ownership of (4) amounts of capital is no longer the only or even the most important (5) of profits and influence; knowledge as well as (6) capital brings profits and influence.
There arc many (7) with the thesis above, not the least of (8) is that wealthy capitalists can buy the experts and knowledge they need to keep their profits and influence. But this does not (9) the importance of knowledge in an advanced industrial society, as the (10) of some new industries indicates. (11) , genetic engineering and the new computer technology have (12) many new firms and made some scientists quite rich. In (13) with criticism of the postindustrial society thesis, however, it must also be (14) that those already in control of huge amounts of capital (i. e., major corporations) soon (15) to take most profits in these industries based on new knowledge.
Moving down from the level of wealth and power, we still find knowledge increasingly (16) . Many new high-tech jobs are being created at the upper-middle-class level, but even more new jobs are being created in the low-skill, low-paying service (17) . Something like a caste line is emerging centered around knowledge. Individuals who fall too far behind in the (18) of knowledge at a young age will find it almost impossible to catch up later, no matter how hard they try. Illiteracy in the English language has been a severe (19) for many years in the United States, but we are also moving to the point when computer illiteracy will hinder many more people and (20) them to a life of low-skill and low-paid labor.

Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.4（）

A:dominant B:impressive C:magnificent D:significant

That performance was （pretty） impressive.

A:completely B:very C:beautifully D:equally

That performance was （pretty） impressive.

A:completely B:beautifully C:very D:equally