城市燃气储配站的用地一般与罐容和储罐的类型有关，占地（）hm²。

A.0.6～1.8

B.0.6～2.8

C.0.6～3.8

D.0.6～4.8

It's said that you ______ several countries where the UN ______  programs to help people in the

past two years as a Goodwill Ambassador.  [      ]

A. visited; operated

B. have visited; operates

C. are visiting; operates

D. visit; operate