急性阑尾炎最严重的并发症是
A．阑尾穿孔腹膜炎
B．门静脉炎
C．膈下脓肿
D．盆腔脓肿
E．肠叫脓肿
参考答案：B
The little boy still needed the ______ 20 dollars to do with the things ______ .
A．remaining; remained to be settled
B．remaining; remaining to be settled
C．remained; remained to settle
D．remained; remaining to settled
下列事例中，人对物体做功的是（ ）
A．举着杠铃原地不动
B．扛着米袋慢慢登上楼梯
C．提着水桶在水平地面上匀速前进
D．用300N的力推汽车，汽车没动
