□的三角形的面积等于平行四边形面积的一半，□里应填[ ]
A．同底
B．同高
C．同底等高
答案：C
.
He always_________his time and his efforts .
A．made the most of; paid off
B．made good use of; paid back
C．took the most of; paid for
D．made most of; paid up
阻塞性肺气肿患者，不会表现为（）
A.心音减弱
B.X线胸片上气管分叉展开
C.X线胸片上肺的通透性减弱
D.呼气延长
E.叩诊音增强
