消化道x线诊断目前常用的最佳检查方法是( )
A．硫酸钡造影检查
B．腹部透视
C．钡剂双重对比造影检查
D．腹部平片像
E．碘化油造影检查
参考答案：C
--- What' s the matter with Della?
--- Well, her parents wouldn't allow her to go to the party, but she still __
A．hopes to
B．hopes so
C．hopes not
D．hopes for
烟温过高、过低都会（）催化剂的寿命。
A.升高
B.降低
C.不影响
D.无关
