搜题请搜索小程序“爱下问搜题”
问题 选择题
函数y=sin2xcos2x是（　　）
A．周期为
π
2
的奇函数		B．周期为
π
2
的偶函数
C．周期为π的奇函数D．周期为π的偶函数
答案

函数y=sin2xcos2x=

1
2
sin4x，所以函数的周期是：
2π
4
=
π
2
；

因为f（-x）=

1
2
sin（-4x）=-
1
2
sin4x=-f（x），所以函数是奇函数，

故选A．

单项选择题 案例分析题

病历摘要：患者男性，54岁，素有头痛头晕病史，平时性情急躁易努，两小时前因与人争吵时突然昏倒，偏瘫失语，不省人事，由家人抬来医院就诊。症见：神志昏迷，呼之不应，鼻鼾痰鸣，牙关紧闭，面赤气粗，大便秘结，查体见左侧肢体偏瘫，舌质红苔黄腻，脉弦滑有力。

本病证属于阳闭，阳闭与阴闭的区别主要在于什么？（）

A.虚实

B.轻重

C.病位

D.热象

E.神志

F.内风与外风
查看答案
单项选择题

Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior of most people.
"The burnt child fears the fire" is one instance ; another is the rise of despots like Hitler. Both examples also point up the fact that attitudes stem from experience. In one case the experience was direct and impressive; in the other it was indirect and cumulative. The Nazis were indoctrinated largely by the speeches they heard and the books they read.
The classroom teacher in the elementary school is in a strategic position to influence attitudes. This is true partly because children acquire attitudes from those adults whose word they respect.

From the last paragraph, we can see that ______.
A. a teacher’s influence on children is always positive
B. children should be encouraged to reach their own decisions by ignoring objective facts
C. if improperly handled, a teacher’s influence can be very harmful to the children
D. children may develop prejudices if the teacher’s attitude is wrong

Another reason it is true is that pupils often delve somewhat deeply into a subject in school that has only been touched upon at home or has possibly never occurred to them before. To a child who had previously acquired little knowledge of Mexico, his teacher’s method of handling such a unit would greatly affect his attitude toward Mexicans.
The media through which the teacher can develop wholesome attitudes are innumerable. Social studies (with special reference to races, creeds and nationalities) , science matters of health and safety, the very atmosphere of the classroom... these are a few of the fertile fields for the inculcation of proper emotional reactions.
However. when children come to school with undesirable attitudes, it is unwise for the teacher to attempt to change their feelings by cajoling or scolding them. She can achieve the proper effect by helping them obtain constructive experiences.
To illustrate, first grade pupils afraid of policemen will probably alter their attitudes after a classroom chat with the neighborhood officer in which he explains how he protects them. In the same way, a class of older children can develop attitudes through discussion, research, outside reading and all-day trips.
Finally, a teacher must constantly evaluate her own attitudes, because her influence can be deleterious if she has personal prejudices. This is especially true in respect to controversial issues and questions on which children should be encouraged to reach their own decisions as a result of objective analysis of all the facts.
查看答案