第19题: [单项选择]Why are American bills or paper money unlike that in many other countries A. American bills are not the same color. B. American bills are the same size and color. C. American bills are the same color but different size. 参考答案:B 答案解析:[听力原文]13-16 One of the first things a visitor does upon arrival in another country is to get
第23题: [单项选择]有关化学毒物化学结构与毒性效应之间关系的研究的陈述中,不正确的是() A. 有助于从分子水平乃至量子水平阐明化学毒物的毒理机制 B. 有助于指导新化学物质或药物的设计和合成 C. 有助于指导解毒药物的筛选 D. 有助于评价人群的易感性 E. 有助于预估新化学物质的安全限量标准范围 参考答案:D