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问题 单项选择题

以下哪项不是妊娠期心脏病诊断的主要依据（）

A.孕前有风湿热和心脏病史，孕期出现心功能异常的症状

B.有舒张期杂音或性质粗糙、时限较长的收缩期杂音，尤其有震颤并存者

C.严重的心律失常，如心房颤动、心房扑动、Ⅲ度房室传导阻滞、舒张期奔马律等

D.有明显的心界扩大及心脏结构异常

E.孕妇自觉心慌、气促，心前区听到柔和的收缩期吹风样杂音

答案

参考答案：E

选择题

在我国社会主义初级阶段，国有经济的主导作用主要体现在控制力上。对国有经济的控制力，我们应当这样来理解

①对关系到国民经济命脉的重要行业和关键领域，国有经济必须占支配地位

②普通竞争行业，国有经济逐步退出

③控制力表现在国有经济越多越好

④对于那些重要行业的龙头企业或重点企业，国有经济不一定要保持100%的股份

A．①②④

B．①③④

C．①④

D．①②③④
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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.

9（）

A.movement

B.sign

C.symbol

D.activation
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