第7题: [单项选择]下列哪项是白秃疮的特点() A. 灰白色鳞屑斑片 B. 特殊的鼠尿臭味 C. 愈后留有疤痕 D. 毛发永久脱落 E. 病发刚出头皮即折断 参考答案:A 答案解析:白秃疮初起为大小不等红色丘疹,灰白色鳞屑斑片,日久蔓延成片,毛发干枯、易断,易拔脱而不痛,多数在距头皮2~4毫米处头发自行折断,在近头皮的发干上常有灰白色菌鞘围绕。
第27题: [单项选择]This passage mentions all of the following causes for the extinction of many species EXCEPT
A. natural selection of species. B. various natural disasters. C. commercial trade and killing D. destruction of natural surroundings. 参考答案:B