27. —It’s difficult for college graduates to find a good job in China.

—It depends on whether they have ______ it takes to be successful in today’s world.

A．that

B．which

C．what

D．whether

麻醉期间引起心肌氧耗增加或心肌缺氧的原因哪项不确切（）。

A.病人精神紧张、恐惧和疼痛

B.血压偏低

C.麻醉期间供氧不足

D.各种原因引起的心率加快

E.麻醉药对心肌收缩力的抑制使心排血量减少