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问题 单项选择题

矿山安全技术

《煤矿安全规程》规定确定火灾熄灭后才能启封火区，下列不属于火灾熄灭启封条件的是( )。

A．气温下降到30℃以下，或与火灾发生前该区的空气日常温度发火前相同

B．火区内氧气浓度下降到5%以下

C．区内空气中不含乙烯、乙炔，一氧化碳在封闭期间内逐渐下降，并稳定在0.01%以下

D．在火区的出水温度低于25℃，或与火灾发生前该区的日常出水温度相同

答案

参考答案：C

单项选择题

刚从暗处走到亮处，两眼什么也看不到，经过几秒钟后才恢复正常。这属于（）

A.感觉的适应

B.感觉的对比

C.感觉的相互作用

D.感觉的补偿
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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.

14（）

A.repaired

B.impaired

C.healed

D.damaged
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