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问题 单项选择题

女性，55岁。HBsAg（+）10余年。2周前出现消瘦、乏力，AFP>1000μg/L。行剖腹探查，术中发现肝癌结节位于肝右前叶，直径约1cm。在该患者术前的影像学检查中，哪项阳性的可能性最大？（）

A.肝脏B超

B.肝脏增强CT

C.肝脏增强MRI

D.CTAP

E.DSA

答案

参考答案：E

解析：数字减影肝血管造影（DSA），可显示0.5～1.0cm大小的微小肿瘤。

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.\

6（）

A. getting by

B. getting on

C. getting through

D. getting over
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单项选择题 A1/A2型题

神经-骨骼肌接头处兴奋传递的特点不包括（）

A.递质是Ach

B.有时间延搁

C.单向传递

D.Ach可被轴突末梢重摄取并反复利用

E.神经递质被酶水解
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