We haven’t heard from her for weeks．How do you suppose      with her studies now?

A．is she getting along

B．she gets along

C．she is getting on

D．she had got on

下图是反应CO(g) +2H₂ (g)=CH₃OH (g)进行过程中的能量变化曲线。下列相关说法正确的是

A．该反应是吸热反应

B．使用催化剂后反应热减小

C．热化学方程式为CO(g) +2H₂(g) =CH₃OH(g) △H= -510 kJ/mol

D．曲线a表示不使用催化剂时反应的能量变化，曲线b表示使用催化剂后的能量变化