主动脉瓣关闭良好，无需切开升主动脉的患者通常采用（）
A.顺行灌注
B.逆行灌注
C.先顺行，后逆行
D.先逆行，后顺行
E.以上都不对
参考答案：A
根据句意选择与句中画线部分意义相同或相近且能代替的选项。
1. What's the matter with Li Lei?
A. wrong
B. trouble
C. the wrong
D. the troubles
2. I don't have much money.
A. a lots of
B. lots of
C. many
D. some
3. When does the party start?
A. finish
B. begin
C. last
D. began
4. He didn't come home until 1 a.m.
A. on
B. till
C. at
D. in
5. I'm not feeling well at the moment.
A. now
B. just now
C. then
D. that time
人才成长、发展和充分发挥作用的前提是（）。
A.人才培养
B.人才引进
C.人才流动
D.人才使用
