Let Jane ________ the art club. She likes drawing. [ ]

A. joining    

B. join    

C. joins    

D. to join

COPD患者，发热，咳嗽，呼吸困难，医生诊断其Ⅱ型呼吸衰竭，下列的血气结果哪一个符合

A．PaO₂＜50mmHg，PaCO₂＞45mmHg

B．PaO₂＜60mmHg，PaCO₂＞60mmHg

C．PaO₂＜60mmHg，PaCO₂＞50mmHg

D．PaO₂＜40mmHg，PaCO₂＞40mmHg

E．PaO₂＜70mmHg，PaCO₂＞55mmHff