影响铁路运输安全的人员因素中，铁路运输系统外人员主要包括（）。 A.旅客 B.机动车

冒泡排序算法在最好的情况下的元素交换次数为【 】。

阅读理解。

     There is a one-day holiday in most western countries on New Year's Day. The real celebration begins

on New Year's Eve-the night before New Year's Day. There are several interesting customs (习惯) in the

west, and there are many differences in different countries.

     Though Christmas is a good time for families to get together, New Year's Day is a time for some

western people to be with friends. On New Year's Day, there are always parties. At such parties, there is

food, drinks and dances until New Year comes

     At midnight, people often say "Happy New Year! "to each other. In many western countries, fireworks

are let off at midnight and some people like to shout aloud to drive away evil spirits.

1. People begin to have great celebrations for the New Year on _____.

A. New Year's Day

B. the night before New Year's Eve

C. the night of New Year's Day

D. New Year's Eve

2. In the west, _____ on New Year's Day.

A. friends always get together

B. friends write to each other

C. people can have a week's holiday

D. people go from one country to another

3. On New Year's Eve, western people don't often _____.

A. say "Happy New Year" to each other

B. let off fireworks

C. sing a Scottish song

D. shout aloud to drive away evil spirits

4. This passage mainly (主要) tells us _____.

A. western people drink together on New Year's Day

B. how western people celebrate their New Year's Day

C. what western people eat on New Year's Day

D. western people have a good time on New Year's Day

PEG修饰的纳米粒，可增加药物在病变部位的聚集，可能由于（）

A.加长其在循环系统中的滞留时间

B.降低在血中的清除率，延长清除半衰期

C.减少肝、脾、肺中的分布

D.主动靶向病变部位

E.EPR效应

集合资产管理计划管理人出于托管人利益的保护可向托管人保证最低收益。( )

大量异烟肼长期使用可能引起的不良反应中应除外

A．周围神经炎

B．肝毒性

C．精神病

D．肾毒性

E．视神经炎