搜题请搜索小程序“爱下问搜题”
问题 单项选择题

患者，男，60岁，劳力性呼吸困难3年，双下肢水肿半月，查体：口唇发绀，颈静脉怒张，心率110次／分，律齐，S1、S2均减弱，P2＞A2，心尖部闻及室性奔马律及3／6级收缩期杂音，肝脾肿大，双下肢水肿，为正确诊断，最需做的是（）。

A.心电图

B.超声心电图

C.测静脉压

D.心电向量图

E.胸部X线检查

答案

参考答案：B

解析：题干信息"劳力性呼吸困难，口唇发绀，颈静脉怒张，心率110次／分，S1、S2均减弱，心尖部闻及室性奔马律及3／6级收缩期杂音，肝脾肿大，双下肢水肿"，以上均为慢性充血型心力衰竭的典型临床表现，故为进一步明确诊断，最需要行超声心动图检查，了解心脏各房室的大小及心脏的收缩及舒张功能。

单项选择题 A1型题

遗传流行病学与传统流行病学的主要区别是（）

A.遗传流行病学主要研究基因频率及影响基因频率的因素

B.遗传流行病学着眼于群体疾病的研究

C.遗传流行病学在研究疾病在人群中的分布、病因以及制定预防对策时首先考虑遗传因素及家庭相似性

D.遗传流行病学主要研究遗传性疾病，未与健康状况挂钩

E.遗传流行病学主要阐明正常性状的传递规律及遗传病的遗传原理
查看答案
单项选择题

When a disease of epidemic proportions threatens the public, scientists immediately get to work, trying to locate the source of affliction and find ways to combat. Vaccination is one of the effective ways to protect the (1) population of a region or country which may be (2) grave risk. The process of vaccination allows the patient’s body to (3) immunity to the virus or disease so that, if it is encountered, one can fight it (4) naturally. To accomplish this, a small weak or dead (5) of the disease is actually injected into the patient in a controlled environment, (6) his body’s immune system can learn to fight the invader (7) . Information (8) how to penetrate the disease’s defenses is (9) to all elements of the patient’s immune system in a process that occurs naturally, in which genetic information is passed from cell to cell. This makes sure that (10) the patient later come into contact with the real problem, his body is well equipped and trained to (11) with it, having already done so before.

There are, however, dangers (12) in the process. (13) , even the weakened version of the disease contained in the vaccine proves (14) much for the body to handle, resulting in the immune system (15) , and, therefore, the patient’s death. Such is the case of the smallpox vaccine, (16) to eradicate the smallpox epidemic that nearly (17) the whole Native American population and killed massive numbers of settlers. (18) 1 in 10,000 people who receive the vaccine (19) the smallpox disease from the vaccine itself and dies from it. Consequently, the process, which is truly a (20) , may indeed hide some hidden curses.

17（）

A.wiped out

B.ruled out

C.break down

D.died out
查看答案