第7题: [单项选择]列车上严禁出售()和过期、变质食品。 A. 没有生产批准号 B. 无生产日期、有效期 C. 无生产单位、日期、保质期 D. 无商标及生产许可证 参考答案:C
第8题: [单项选择]下列哪些是异位妊娠的超声表现() A. 附件区显示形状不规则包块 B. 宫腔空虚 C. 直肠子宫陷凹有积液 D. 宫旁包块内可见妊娠囊 E. 以上都是 参考答案:E
第9题: [单项选择]Basic research is vital because ______. A. it leads to results that can be appreciated B. it is driven out by applied research C. it provides the basis for scientific progress D. its results cannot be anticipated 参考答案:C 答案解析:[解析] 根据文章第二段第三句前半部分Leaving aside the funds devoted to research by industry- which is naturally far m