第27题: [单项选择]不能使冠状动脉扩张的药物是 A. 地尔硫卓 B. 硝苯地平 C. 维拉帕米 D. 硝酸甘油 E. 昔萘洛尔 参考答案:E
第28题: [单项选择]All ______ is a continuous supply of fuel oil. A. the thing needed B. what is needed C. that is needed D. for their need 参考答案:C 答案解析:[解析] 在定语从句中如果先行词是不定代词all,anything,everything,nothing,much等或先行词前是all,any, every,little,much等词,其后的定语从句