船舶、设施发生交通事故，应由（）查明原因，判明责任。A．海事法院 B．海事机构 C．

It is well-known that the “prom”, a formal dance held at the end of high school or college, is an important date in every student’s life. What is less well-known is that the word “prom” comes from the verb “to promenade”, which means to walk around, beautifully dressed, in order to attract attention. The idea is that you should see and be seen by others.

The prom is not just an American tradition, though most people believe that it started in America. In Canada the event is called a “formal”. In Britain and Australia the old fashioned word “dance” is more and more frequently being referred to as a “prom”. Most countries have some form of celebration when students finish high school: after all, it means the end of life as a child, and the beginning of life as an adult.

The prom is expensive to organize and the tickets can cost students a lot of money. The tradition is that students themselves have to raise the money to pay for it. Selling the students newspapers is one way to raise money; so is taking a part-time job at the weekend.

Although the prom should be the experience of a lifetime, it also worries many students. There is the problem of what to wear, who to take as your partner, who will be voted “prom queen”, etc. And it is not only students who feel worried. What many parents find difficult is the realization that their children’s school days are almost over. However, for most people at the prom, once the music starts playing, everyone relaxes and stops worrying.

小题1:In which country is the prom called a “formal”?

A．America.

B．Canada.

C．Britain.

D．Australia.小题2:Why is the prom important in the students’ lives?

A．It’s the sign of becoming an adult.

B．It’s an old tradition in many countries.

C．There are many problems to work out.

D．The students can raise money by themselves.小题3:What is the passage mainly about?

A．The history of the prom.

B．The traditions of the prom.

C．The development of the prom.

D．The general information of the prom.

x的4倍与5的和，用式了表示是4x+5．______．

也许令许多经常坐办公室的人感到意外的是，长时间坐在那里已使他们成为腰肌劳损的高危人群。市卫生部门发行了一个小册子，教人们如何通过做一些运动来进行每天一次的锻炼，来避免这部分人出现腰肌劳损。 以下哪项如果为真，最能对上述小册子的效果提出质疑

A．有些人的腰肌劳损靠锻炼难以预防。

B．预防腰肌劳损的方案因人而异。

C．经常锻炼的人也可能患腰肌劳损。

D．做锻炼的效果不如在医院的护理与治疗。

E．经常坐办公室的人不大可能做每天一次的锻炼。

我某轻工业进出口公司向国外客户出口某商品一批，合同中规定以即期不可撤销信用证为付款方式，信用证的到期地点规定在我国。为保证款项的收回，应议付行的要求，我方商请香港某银行对中东某行(开证行)开立的信用证加以保兑。在合同规定的开证时间内，我方收到通知银行(即议付行)转来的一张即期不可撤销保兑信用证。我出口公司在货物装运后，将有关单据交议付银行议付。不久接保兑行通知：“由于开证行已破产，我行将不承担该信用证的付款责任。”问：①保兑行的做法是否正确为什么②对此情况，我方应如何处理

单相及多相合金的结晶何谓结晶过程中的溶质再分配？它是否仅由平衡分配系数K0所决定？当相图上的液相线和固相线皆为直线时，试证明K0为一常数。