下列细胞中能与IgG的Fc片段结合的是( )。A．红细胞 B．树突状细胞 C．NK

Mark Twain once observed that giving up smoking is easy. He knew, because he’d done it hundreds of times himself. Giving up for ever is a trifle more difficult, apparently, and it is well known that it is much more difficult for some people than for others. Why is this so

Few doctors believe any longer that it is simply a question of will power. And for those people that continue to view addicts as merely "weak", recent genetic research may force a rethink. A study conducted by Jacqueline Vink, of the Free University of Amsterdam, used a database called the Netherlands Twin Register to analyze the smoking habits of twins. Her results, published in the Pharmacogenomics Journal, suggest that an individual’s degree of nicotine dependence, and even the number of cigarettes he smokes per day, are ply genetically influenced.

The Netherlands Twin Register is a voluntary database that contains details of some 7,000 pairs of adult twins (aged between 15 and 70 ) and 28,000 pairs of childhood twins. Such databases are prized by geneticists because they allow the comparison of identical twins (who share all their genes) with fraternal twins (who share half). In this case, however, Dr. Vink did not make use of that fact. For her, the database was merely a convenient repository of information. Instead of comparing identical and fraternal twins, she concentrated on the adult fraternal twins, most of whom had completed questionnaires about their habits, including smoking, and 536 of whom had given DNA samples to the register.

The human genome is huge. It consists of billions of DNA "letters", some of which can be strung together to make sense (the genes) but many of which have either no function, or an unknown function. To follow what is going on, geneticists rely on markers they have identified within the genome. These are places where the genetic letters may vary between individuals. If a particular variant is routinely associated with a particular physical feature or a behavior pattern, it suggests that a particular version of a nearby gene is influencing that feature or behavior.

Dr. Vink found four markers which seemed to be associated with smoking. They were on chromosomes 3, 6, 10 and 14, suggesting that at least four genes are involved. Dr. Vink hopes that finding genes responsible for nicotine dependence will make it possible to identify the causes of such dependence. That will help to classify smokers better (some are social smokers while others are physically addicted) and thus enable "quitting" programs to be customized.

Results such as Dr. Vink’ s must be interpreted with care. Association studies, as such projects are known, have a disturbing habit of disappearing, as it were, in a puff of smoke when someone tries to replicate them. But if Dr. Vink really has exposed a genetic link with addiction, then Mark Twain’s problem may eventually become a thing of the past.

It can be inferred from the last paragraph that（）

A. Dr. Vink does not treat her research results with enough care

B. there are always people who try to copy other’s researches

C. Mark Twain’s problem will be other smokers’ problem in the future

D. many such researches as Dr. Vink’ s have not been done thoroughly

科目汇总表账务处理程序又称汇总记账凭证账务处理程序。它是根据记账凭证定期编制科目汇总表，再根据科目汇总表登记总分类账的一种账务处理程序。

下列关于非公开募集基金的说法，正确的是（）。

Ⅰ.非公开募集基金应当向合格投资者募集，合格投资者累计不得超过二百人

Ⅱ.非公开募集基金募集对象是少数特定投资者

Ⅲ.未经登记，任何单位或者个人不得使用“基金”或者“基金管理”字样或者近似名称进行证券投资活动

Ⅳ.募集机构不得通过公开出版资料等方式推介私募基金

A.Ⅰ、Ⅱ、Ⅲ、Ⅳ

B.Ⅰ、Ⅱ、Ⅳ

C.Ⅰ、Ⅲ、Ⅳ

D.Ⅰ、Ⅱ、Ⅲ

下列语句中，获得列表框List1中项目个数的语句是（ ）。

A． x=List1．ListCount

B． x=ListCount

C． x=List1．ListIndex

D． x=ListIndex

自铁路运输企业发出领取货物通知之日起满（）仍无人领取的货物，或者收货人书面通知铁路运输企业拒绝领取的货物，铁路运输企业应当通知托运人，托运人自接到通知之日起满三十日未作答复的，由铁路运输企业变卖。