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.