第18题: [单项选择]霍乱的发病机制是() A. 霍乱弧菌对肠壁的作用 B. 霍乱弧菌引起肠功能紊乱 C. 霍乱弧菌内毒素引起小肠过度分泌 D. 霍乱弧菌肠毒素引起小肠过度分泌 E. 霍乱弧菌内毒素引起肠道病变 参考答案:D
第19题: [单项选择]The crisis in our industry was ______ by intense competition from foreign producers. A. brought on B. brought forward C. brought up D. brought round 参考答案:A 答案解析:短语辨析题。bring on“引起、导致、产生”;bring forward“提出”;bring up“养育、抚养”;bring round“使恢复知觉,使苏醒”。根据句意,A为正确答案。句意:我们企