第15题: [单项选择]A. Because they came to America from the Netherlands. B. Because they spoke Dutch. C. Because Deutsch sounded like Dutch. D. Because Deutsch was the full spelling of Dutch. 参考答案:C 答案解析:[听力原文] Why did American call Germans Dutch in the 18th century
第16题: [单项选择]适应性免疫应答的执行者是() A. 皮肤、黏膜 B. 吞噬细胞 C. T及B淋巴细胞 D. 血液和体液 E. 自然杀伤细胞 参考答案:C 答案解析:适应性免疫应答又叫获得性免疫应答,主要由T淋巴细胞和B细胞执行其功能。
第17题: [单项选择]The differences between Chinese and western society can ______ misunderstandings. A. course B. causes C. create D. rise 参考答案:C 答案解析:[解析] course“课程,过程”;cause“引起,造成”;create“引起,产生”;rise“上升,起立”。选项B和C都有“引起”的意思,但选项B不是动词原形,不能跟在can后。所以,选项C是