城市规划要充分引导商业性开发，首先就需要有充分的（）。
A.公共性
B.公平性
C.公开性
D.公益性
参考答案：C
符合I型呼吸衰竭的动脉血气标准是（）
A.PaO2为50mmHg，PaCO2为40mmHg
B.PaO2为55mmHg，PaCO2为50mmHg
C.PaO2为65mmHg，PaCO2为40mmHg
D.PaO2为70mmHg，PaCO2为40mmHg
E.PaO2为70mmHg，PaCO2为45mmHg
Not only I but also her teacher ___________ China many times.
A．has gone to
B．went to
C．has been to
D．had been to
