PaCO2升高10mmHg时将使pH降低（）。
A.0.01
B.0.02
C.0.04
D.0.06
E.0.08
参考答案：E
He__________ he would be able to leave tomorrow, but it's beginning to took difficult．
A．hopes
B．was hoping
C．had hoped
D．hoped
全酶
