从安全与降低损耗两方面考虑汽油罐采用（）较适宜。
A、金属拱顶
B、金属浮顶
C、非金属罐
参考答案：B
As the family did not make a(n) _____ ahead of time, they had to wait at the restaurant in order to get a table.
A．approval
B．reservation
C．arrangement
D．enquiry
一国居民直接在另一国家进行对企业的投资的行为是（）。
A.直接投资
B.间接投资
C.BOT
D.引入外资
