1903年，美国人( )制造出了飞机
A．莱特兄弟
B．富尔顿
C．福特
D．瓦特
参考答案：A
Mr. White had no money for the taxi, so he had to ______ home.
A．walk back to
B．walked back to
C．walks back
D．walk back
Ⅱ型呼吸衰竭的诊断，下列正确的是（）
A.PaO265mmHg，PaCO252mmHg
B.PaO262mmHg，PaCO250mmHg
C.PaO252mmHg，PaCO259mmHg
D.PaO255mmHg，PaCO230mmHg
E.PaO264mmHg，PaCO252mmHg
