我国要尽快采取积极措施完善针对（）的服务机构，构建我国在全球的科技人才网络。
A.科研人员
B.留学人员
C.海外华人
D.海外华侨
参考答案：B, D
．______ surprised the family most was ________the girl played basketball very well．
A．That; that
B．That; what
C．What; that
D．What; what
房性早搏（）
A.起源部位在心房
B.起源部位在心室
C.起源部位在心肌
D.起源部位在窦房结
