第14题: [单项选择]每1克组织的致病菌数一般需超过多少才能引起感染 A. 10 6 B. 10 5 C. 10 4 D. 10 3 E. 10 2 参考答案:A 答案解析:[解题思路] 实验资料指出,每1组织内的致病菌数需超过106才引起感染。但局部有坏死组织,血肿或异物时,每1g组织内有100个致病菌即发生感染。
A. would complete B. had been completed C. had completed D. would have been completed 参考答案:D 答案解析:[分析] 测试点为虚拟语气。从if从句动词had not stopped中可看出,本句是表示与过去事实相反的虚拟语气,主句相应的应为should(would)have+过去分词形式。此题中需用被动态。