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问题 单项选择题 A1/A2型题

长期卧床对心血管系统的影响错误的是（）。

A.长期卧床血管静压解除使中心血容量增加，导致心率增加

B.由于动脉血流速度下降，下肢血流阻力增加，增加了静脉血栓形成的危险

C.长期卧床使血液黏滞性增加

D.长期卧床导致血液出现重新分配，血液转向下肢

E.血管静压解除使中心血容量增加，血液由下肢转向肺和右心

答案

参考答案：E

多项选择题

证券投资基金对我国经济发展的积极作用有（）。

A.将储蓄转化为投资，提高社会资金使用效率

B.推动证券市场的规范化发展

C.完善金融体系和社会保障体系

D.推动金融市场发展，促进金融产品创新
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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.

4（）

A.explorations

B.examinations

C.detections

D.scans
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