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问题 多项选择题

唯物辩证法就其本质来说是批判的、革命的，因为它( )。

A．认为凡是现存的都是应当灭亡的

B．对每一种既成的形式都从其暂时性方面去理解和对待

C．在对现存事物的肯定理解中包含对现存事物的否定理解

D．认为凡是存在的都是合理的

答案

参考答案：A,B,C

解析： 辩证法是关于自然、社会和人类思想运动发展最一般规律的科学。它认为，世界是互相联系、变化、发展的，没有一成不变的东西，事物的内部矛盾是事物发展的动力、源泉。故选ABC。

单项选择题

通常微型计算机的工作电压允许的变化范围一般是（）。

A、±5%

B、±10%

C、±20%

D、以上都不对
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单项选择题

Young girls at high risk for depression appear to have a malfunctioning reward system in their brains, a new study suggests. The finding comes from research that (1) a high-risk group of 13 girls, aged 10 to 14, who were not depressed but had mothers who (2) recurrent depression and a low-risk group of 13 girls with no (3) or family history of depression. Both groups were given MRI brain (4) while completing a task that could (5) either reward or punishment.

(6) with girls in the low-risk group, those in the high-risk group had (7) neural responses during both anticipation and receipt of the reward. (8) , the high-risk girls showed no (9) in an area of the brain called the dorsal anterior cingulated cortex (背侧前扣带皮质), believed to play a role in (10) past experiences to assist learning.

The high-risk girls did have greater activation of this brain area (11) receiving punishment, compared with the other girls. The researchers said that this suggests that high-risk girls have easier time (12) information about loss and punishment than information about reward and pleasure.

"Considered together with reduced activation in the striatal (纹状体的) areas commonly observed (13) reward, it seems that the reward-processing system is critically (14) in daughters who are at elevated risk for depression, (15) they have not yet experienced a depressive (16) ," wrote Ian H. Gotlib, of Stanford University, and his colleagues. " (17) , longitudinal studies are needed to determine whether the anomalous activations (18) in this study during the processing of (19) and losses are associated with the (20) onset of depression," they concluded. The study was published in the April of the Archives of General Psychiatry.

19（）

A.criticisms

B.punishments

C.rewards

D.allowances
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