随血流的异物堵塞管腔的现象叫做()。
A.梗死
B.血栓形成
C.栓塞
D.栓子
E.血栓
参考答案:C
It's not surprising that Mr. Johnson suddenly fell ill dying. ________ he is already at the age of eighty.[ ]
A. Above all
B. In all
C. At all
D. After all
公元前605年,()主持兴建了我国最早的大型引水灌溉工程——期思雩娄灌区。
A.大禹
B.孙叔敖
C.西门豹
D.李冰