某因素在病因学上与某疾病本无关联，但可引起所研究疾病的症状或体征，从而促使患者及早就

通过诱导免疫耐受可用于治疗（）。

A.慢性细菌感染性疾病

B.病毒的持续性感染

C.自身免疫病

D.免疫缺陷病

E.恶性肿瘤

肾小管对Na＋重吸收最大的部位是（ ）

A．近球小管

B．髓袢降支细段

C．远球小管

D．髓袢升支粗段

E．集合管

Iceland is a popular European tourist destination. Before you go there, it is good to learn some of the basic Iceland customs first.

Just like other countries in Europe, it is one of the customs in Iceland to shake hands and say “Hello”. Kissing each other’s cheeks is acceptable along with wishing each other a happy day.

Another custom is to take off your shoes in the hallway(走廊) when you enter someone’s home. Also, don’t be surprised if someone invites you to their house, since Icelanders love to have guests. Just make sure you take flowers or a similar token of thanks to give them.

If you have been invited to eat, keep in mind that you don’t need to express thanks before meals like the French or the Japanese. Rather, eat heartily and then thank your host afterwards by shaking his hand.

Keep in mind that believing in mysterious beings is part of the tradition in Iceland. Indeed, most of the unique and sometimes strange rock formations in Iceland are due to elves(小精灵), according to the people of Iceland.

Are you planning to spend Christmas in Iceland? If so, make sure you practice saying “Gleileg jol got tog fars!” first, which is the local Christmas greeting. It is part of the tradition in Iceland to have long Christmas holidays—26 days—longer than in any other European country. There are 13 Santa Clauses in Iceland, too!

There may not be a law requiring you to follow the customs, but there is no harm in doing so. Following them, you might be rewarded with a rich cultural experience and a more meaningful trip.

小题1: When you are invited to someone’s home in Iceland, you'd better do all of the following EXCEPT ______.

A．eating heartily and enjoying your time there

B．expressing your thanks to the host before you eat

C．taking some flowers or something else to the host

D．taking off shoes in the hallway before you enter the home小题2:Which of the following is one of the differences in customs between Iceland and France?

A．Shaking hands when greeting.

B．A 26-day-long Christmas holiday.

C．Saying hello when meeting each other.

D．Kissing each other’s cheeks when greeting.小题3:The text is mainly about ______.

A．what some of the customs in Iceland are like

B．why some of the customs in Iceland are special

C．how some of the customs in Iceland were formed

D．what some of the customs are like in Europe小题4: In the text, the author aims to tell us that ______.

A．happiness is a form of courage

B．when in Rome, do as the Romans do

C．practice is the only path to knowledge

D．everyone has good and bad times in life

张某所有的奶牛病了，张某带奶牛到兽医李某处医牛，医疗费200元，张某觉得太贵，不原意支付，李某遂将奶牛扣下，告诉张某如果10天内不交200元钱，就把奶牛卖了抵债，张某不同意，但是没有办法，只好先回家了。下列说法正确的是：

A．李某有权直接变卖奶牛抵偿自己的医疗费
B．如张某未在10日内支付医疗费，则李某可以变卖奶牛抵偿自己的医疗费
C．张某应在2月内支付医疗费，否则李某可以变卖奶牛抵偿自己的医疗费
D．张某应在一段合理的时间内支付医疗费，否则李某可以变卖奶牛抵偿自己的医疗费

空气压缩机组透平单机试车时，准备工作中应检查（）。

A.透平第一级排凝阀全开

B.透平第一级排凝阀全关

C.透平排汽停止阀全开

D.透平进汽阀全开