Sally worked late in the evening to finish her report _______ her boss could read it first next morning.

A．so that

B．because

C．before

D．now that

在H2O分子和CO2分子之间存在的作用力是（）。

A.取向力，诱导力

B.诱导力，色散力

C.取向力，色散力

D.取向力，诱导力，色散力