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问题 多项选择题

股票期货的主要特点有______。

A．交易费用低廉

B．具有杠杆效应

C．使投资者能够进行一揽子股票的套利策略

D．使投资者更快速简单地对冲单一股票的风险

答案

参考答案：A,B,D

解析： 股票期货是以股票为标的物的期货合约，其主要特点有：①交易费用低廉；②卖空股票期货要比在股票市场卖空对应的股票更快捷；③具有杠杆效应；④投资者可以利用股票期货更快速、简便地对冲单一股票的风险；⑤股票期货使投资者能够进行单一股票的套利策略。

单项选择题

有以下程序：
void swap1(int *a,int *b)
int *c=a;
a=b，b=c;

void swap2(int *a,int *b)

int c=*a;
*a=*b，*b=c；

main()
int a=10,b=15;
swap1(＆a,＆b);
printf("%d,%d，"，a,b);
a=10,b=15;
swap2(＆a,＆b);
printf("%d,%d，"，a,b);

其输出结果为( )。

A．15,10,10,15
B．15,10,15,10
C．10,15,10,15
D．10,15,15,10
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单项选择题

Proper arrangement of classroom space is important to encouraging interaction. Most of us have noticed how important physical setting is to efficiency and comfort in our work. College classroom space should be designed to encourage the activity of critical thinking. We may be approaching the twenty-first century, but step into almost any college classroom and you step back in time at least a hundred years. Desks are normally in straight rows, so students can clearly see the teacher but not all their classmates. The assumption behind such an arrangement is obvious. Everything of importance comes from the teacher.
With a little imagination and effort, unless desks are fixed to the floor, the teacher can correct this situation and create space that encourages interchange among students. In small or standard-size classes, chairs, desks, and tables can be arranged in a variety of ways. The primary goal should be for everyone to be able to see everyone else. Larger classes, particularly those held in lecture halls, unfortunately, allow much less flexibility.
Arrangement of the classroom should also make it easy to divide students into small groups for discussion or problem-solving exercises. Small classes with movable desks and tables present no problem. Even in large lecture halls, it is possible for students to turn around and form groups of four to six. Breaking a class into small groups provides more opportunities for students to interact with each other, think out loud, and see how other students’ thinking processes operate all essential elements in developing new modes of critical thinking. In courses that regularly use a small group format, students might be asked to stay in the same small groups throughout the course. A colleague of mine, John, allows students to move around during the first two weeks, until they find a group they are comfortable with. John then asks them to stay in the same seat, with the same group, from that time on. This not only creates a comfortable setting for interaction but helps him learn students’ names and faces.

The primary purpose of desk rearrangement is ______.

A. for the teacher to divide students into small groups
B. to make it possible for students to interact with each other
C. for the teacher to find out how students think
D. to give students more opportunities to practice speaking
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