家庭计算机用户上网可使用的技术是______。A．1，3 B．2，3 C．2，3，4

Anthropology is the study of human beings as creatures of society. It (1) its attention upon those. physical characteristics and industrial techniques, those conventions and values, which (2) one community from all others that belong to a different tradition.

The distinguishing mark of anthropology among the social sciences is that it includes for serious study other societies (3) our own. For its purposes any social (4) of mating and reproduction is as significant as our own. To the anthropologist our customs and those of a New Guinea tribe are two possible social schemes for (5) a common problem, and in so far as he remains an anthropologist he is (6) to avoid any weighting of one (7) the other. He is interested in human behavior, not as it is shaped by one tradition, our own, but as it has been shaped by any tradition (8) He is interested in a wide (9) of custom that is found in various cultures, and his object is to understand the way in which these cultures change and (10) , the different forms through which they express themselves and the (11) in which the customs of any peoples function in the lives of the (12) .

Now custom has not been commonly regarded as a (13) of any great moment. The inner workings of our own brains we feel to be uniquely (14) of investigation, but custom, we have a way of thinking, is behavior at its most commonplace. (15) , it is the other way round. Traditional custom is a mass of detailed behavior more astonishing than (16) any one person can ever evolve in individual actions. Yet that is a rather (17) aspect of the matter. The fact (18) first rate importance is the predominant role that custom (19) in experience and belief, and the very great varieties it may (20)

15（）

A. As a matter of fact

B. On the whole

C. In general

D. On the other hand

已有定义：char c；，程序前面已在命令行中包含ctype.h文件，不能用于判断c中的字符是否为大写字母的表达式是

A) isupper(c)
B) 'A'＜=c＜='Z'
C) 'A'＜=c&&c＜='Z'
D) c＜=('z'-32)&&('a'-32)＜=c

房顶正在修葺，房顶上固定的一根细线垂到三楼窗沿下，某同学为了测量窗的上沿到房顶的高度，将线的下端系了一个小球，发现当小球静止时，细线恰好与窗子上沿接触且保持竖直，然后打开窗子，让小球在垂直于窗子的竖直平面内摆动，如图所示。

①为了测小球的周期，他用手表测量，在小球达到屋外的最高点时数1，同时开始计时，随后每次到达屋外最高点依次数2、3、4、… …数到n时，记下时间为t，于是得出周期为T=t/n；

②他用尺子测出了小球静止时小球球心到窗上沿的距离L。则：

（1）在①中正确的做法应该是[ ]

A．计数位置应在小球运动的最低点，若第一次至第n次同向经过最低点时间为t，则T= t/n

B．计数位置应在最高点，若第一次至第n次到达最高点时间为t ，则T＝t/(n－l)

C．计数位置应在小球运动的最低点，若第一次至第n次同向经过最低点时间为t，则T=t/(n－l)

D．计数位置应在小球运动的最低点，若第一次至第n次同向经过最低点时间为t，则T= 2t/(n－1 )

（2）用周期T及在最低点球心到窗上沿的距离L，及当地重力加速度g，表示房顶到窗上沿的高度h=____________________。

类固醇皮质激素主要用于治疗哪一类型的MS（）

A.复发-缓解型

B.继发进展型

C.原发进展型

D.进展复发型

E.以上都是

负强化与惩罚的含义相同。 ( )