There ______ lots of sheep on the hill eating grass. [ ]
A. are
B. is
C. be
答案:A
高血压患者常损害的靶器官有_______、________、_________、______________
药物中杂质检查结果通常可用下列方法表示()
A、<100μg
B、600ppm
C、<0.06%
D、0.08%
E、小于百万分之五十