She _________ the wrong button last time.
A. doesn’t press
B. don’t press
C. didn’t press
D. hasn’t pressed
查看答案
There are ________ things to do.
A. the number of
B. a number of
C. numbers of
D. number
Would you show me __________ the printer.
A. use
B. using
C. what to use
D. how to use
上消化道出血的主要症状是
A. 恶心、呕吐
B. 呕血、黑便
C. 头晕、目眩
D. 脉搏细速
E. 呼吸浅快
胃十二指肠溃疡瘢痕性幽门梗阻的主要表现是
A. 嗳气、恶心、呕吐
B. 少尿、便秘
C. 阵发性胃收缩痛
D. 呕吐宿食与腹部胀痛
E. 低钾低氯性碱中毒