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问题 单项选择题

患者，男性，76岁。反复晕厥伴抽搐2天来院。既往无胸痛、发绀、水肿及气短史。入院血压180／80mmHg，心率45次／分，律齐，可闻及大炮音。心电图示：P波与QRS波无关，QRS波规律整齐。其反复晕厥伴抽搐的原因最可能的是（）

A.高血压脑病

B.窦性心动过缓伴室性期前收缩

C.三度房室传导阻滞

D.二度Ⅰ型房室传导阻滞

E.阵发性心房颤动伴部分房室传导阻滞

答案

参考答案：C

解析：根据患者病史及心脏查体、心电图结果，首先考虑为三度房室传导阻滞。

单项选择题

Motherhood may make women smarter and may help prevent dementia in old age by bathing the brain in protective hormones, US reseachers reported on Thursday.
Tests on rats show that those who raise two or more litters of pups do considerably better in tests of memory and skills than rats who have no babies, and their brains show changes that suggest they may be protected against diseases such as Alzheimer’s. University of Richmond psychology professor Craig Kinsley believes his findings will translate into humans.
"Our research shows that the hormones of pregnancy are protecting the brain, including estrogen, which we know has many neuroprotective effects, " Kinsley said.
"It’s rat data but humans are mammals just like these animals are mammals, " he added in a telephone interview. "They go through pregnancy and hormonal changes. "
Kinsley said he hoped public health officials and researchers will look to see if having had children protects a woman from Alzheimer’s and other forms of age-related brain decline.
"When people think about pregnancy, they think about what happens to babies and the mother from the neck down, " said Kinsley, who presented his findings to the annual meeting of the Society of Neuroscience in Orlando, Florida.
"They do not realize that hormones are washing on the brain. If you look at female animals who have never gone through pregnancy, they act differently toward young. But if she goes through pregnancy, she will sacrifice her life for her infant—that is a great change in her behavior that showed in genetic alterations to the brain. \

How do scientists know "motherhood may make women smarter"

A. Some researchers have told them.
B. Many women say so.
C. They know it by experimenting on rats.
D. They know it through their own experience.
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单项选择题

各国政府在宏观调控时，发挥内在稳定器的功能（）

A.旨在减少周期性的波动

B.旨在稳定收入，刺激价格波动

C.足够保持经济的充分稳定

D.推迟经济的衰退
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