单选题结节性多动脉炎的病理特点是

单选题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./

单选题下述病变中，与大肠癌关系不密切的是

单选题前庭器官是指( ) A．球囊斑 B．椭圆囊斑 C．蜗管 D．半规管和壶腹 E．半规管、椭圆囊和球囊

单选题 利用孕妇外周血分离胎儿细胞是一项 ( ) A、非创伤性产前诊断技术 B、创伤性产前诊断技术 C、创伤性很大的产前诊断技术 D、和脐带穿刺术同类 E、以上都不对

单选题正常机体体温的昼夜节律变化表现为

单选题下列关于近端小管重吸收的叙述，正确的是

单选题慢性肝炎时出现的毛玻璃细胞，在电镜下的主要变化是

单选题A．血浆胶体渗透压降低 B．组织液静水压降低 C．毛细血管通透性增加 D．淋巴和(或)静脉回流受阻

单选题下列不会导致空气栓塞的是

单选题对于水平方向眼震颤的叙述，恰当的是

单选题A．含铁血黄素B．脂褐素C．黑色素D．胆红素

单选题下列哪种感觉不属于皮肤感觉( ) A．触觉 B．痛觉 C．位置觉 D．冷觉 E．温觉

单选题大肠癌最好发于

单选题关于原发性综合征的描述，哪一项是不正确的

单选题下列哪个器官的梗死灶常为地图形

单选题下述凝血块中，不属于血栓形成的是

单选题脓肿是指

单选题胰高血糖素和生长抑素在胰岛内对胰岛素分泌的调节属于

单选题下列有关风湿性心脏病的描述，不恰当的是