商业企业首次经营的品种是指
A.第一次经营的品种
B.新生产的新药及已经经营的药品更改进货渠道
C.医疗机构
D.A+B
参考答案：D
The shoes are _____ than I expected.
A．far expensive
B．far too expensive
C．far much expensive
D．far more expensive
何谓超声心动图？
