What do you mean _____ saying “out of question”?
A．of
B．in
C．by
D．with
答案：C
I haven’t got a single from Uncle Sam since I saw him last time.
A．message
B．news
C．advice
D．information
某种益生菌直径为0.000000314厘米，用科学记数法表示为______厘米．
