________ theme of the Shanghai Expo was “Better city, better life”． It sent _____ message to people around the world to care about the places where they live．

A．/…a

B．The…a

C．A…the

D．/…the

进行子宫输卵管造影的时间应选择在（）。

A.卵泡期

B.月经期

C.月经前期

D.黄体期

E.月经期后5～10天