问题 单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or nonpersonal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

The child’s basic understanding of the world around it is formed ______.

A.at kindergarten

B.in the earliest months

C.by classroom instructors

D.through interaction with parents

答案

参考答案:B

解析:

[分析]: 细节题型。 见第一段第二句:In the earliest months,messages from nurturers constitute the child’s basic understanding of the world around it.

问答题

(1)为了测量一节干电池的电动势和内电阻,实验室准备了下列器材供选用:

A.待测干电池一节

B.直流电流表(量程0~0.6-3A,0.6A挡内阻为0.1Ω,3A挡内阻为0.02Ω)

C.直流电压表(量程0~3~15V,3V挡内阻为5kΩ,15V挡内阻为25kΩ)

D.滑动变阻器(阻值范围为0~15Ω,允许最大电流为1A)

E.滑动变阻器(阻值范围为0~1000Ω允许最大电流为0.2A)

F.开关

G.导线若干

①在图(甲)中将所选器材用铅笔画线代表导线进行实物连线;

②为尽可能减少实验的误差,其中滑动变阻器选______(填代号);

③根据实验记录,画出的U-T图线如图(乙)所示,从中可求出待测干电池的电动势为______V,内电阻为______Ω.

(2)用油膜法估测分子大小的实验步骤如下:

①向体积为V1的纯油酸中加入酒精,直到酒精油酸溶液总量为V2

②用注射器吸取上述溶液,一滴一滴地滴入小量筒,当滴入n滴时体积为V3

③往边长为30~40cm的浅盘里倒入2cm深的水;

④用注射器往水面上滴1滴上述溶液,等油酸薄膜形状稳定后,将事先准备好的玻璃板放在浅盘上,并在玻璃板上描出油酸薄膜的形状;

⑤将画有油酸薄膜轮廓形状的玻璃板,放在画有许多边长为a的小正方形的坐标纸上,计算出轮廓范围内正方形的总数为N.

则上述过程中遗漏的步骤是______;油酸分子直径的表达式a=______.

(3)某同学做“练习使用示波器”实验观察正弦规律变化的电压图线时,在示波器荧屏上出现如图丙(a)所示的图线,为了将图线调整为图丙(b)所示的形状,他采取了下列措施:

A.调节竖直位移旋钮,使整个图线向下移动

B.保持同步极性选择开关不动,仍置于“+”位置

C.调节Y增益使图形的振幅增大

D.调节X增益使图形的横向幅度增大

其中正确的是______.

判断题