如图所示的是在同一坐标系中甲、乙、丙三电源的U-I图线，甲和丙图线平行，下列判断

Man has a big brain. He can think, learn and speak. Scientists used to think that man are different from animals because they can think and learn. They know now that animals--dogs, rats and birds--can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or hungry. or unhappy. Apes are our nearest cousins. They can understand some things mole quickly than human beings, and one or two have learned a few words. But they are still different from us. They cannot join words and make sentences. They cannot think like us because they have no language. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child can. speak his own language vet well when he is four or five--but no animal learns to speak. How do children learn Scientists do not really know. What happens when we speak Scientists do not know. They only know that man can speak because he has a big brain.

Now, scientists still don’t really know （）

A．whether animals can think about the past and the future

B．how children learn and what happens when we speak

C．at what age, a child can speak his language very well

D．what animal can understand some things more quickly than human beings

乳腺癌锁骨上野半野照射时应（）。

A.打开Y轴下半部（Y1）

B.打开X轴右半部（X1）

C.关闭Y轴上半部（Y2）

D.关闭X轴右半部（X2）

E.关闭Y轴下半部（Y1）

陆钦斯的______是定势影响迁移的一个典型例证。

娱乐场所因违反《娱乐场所管理条例》规定，1年内被2责令停业整顿又有违反本条例的行为应受行政处罚的，由原发证机关吊销娱乐经营许可证。

采用隔行扫描方式的主要目的是（）。

A.提高图像的闪烁频率；

B.降低信号的频带宽度；

C.使图像具有连续感；

D.使收、发端扫描同步