单项选择题
The weather today is()it was yesterday.
A. not as hotter as B. as hotter C. as hot as D. not as hot than
单项选择题 甲亢患者术前准备可以降低手术的基础代谢率，至少降至（）.
单项选择题 对心力衰竭患者进行择期手术，至少待心衰控制以后（）.
单项选择题 设y=2x3，则dy=（）
