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问题 单项选择题 A3型题

女性，76岁。反复咳嗽、咳痰伴喘息20余年，活动后气短5年，间断双下肢水肿1年，加重伴心悸1周。吸烟史30余年。查体：口唇发绀，桶状胸，双肺呼吸音粗，可闻及散在干啰音，双肺底可闻及水泡音，肝肋下2cm，双下肢凹陷性水肿。

以下对明确诊断最有帮助的检查为（）

A.胸片

B.心电图

C.血常规

D.肺功能

E.血气分析

答案

参考答案：D

解析：根据患者病史，症状及体征考虑患者为慢性阻塞性肺疾病，慢性肺源性心脏病，诊断COPD最有意义的检查是肺功能。

单项选择题

Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.

Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\

18（）

A. in time

B. overtime

C. at times

D. behind time
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单项选择题 A1/A2型题

具有结合抗原能力的抗体可变区分子片段称为（）

A.嵌合抗体

B.小分子抗体

C.双特异性抗体

D.单克隆抗体

E.多克隆抗体
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