四进制数201(4)表示的十进制数的是[ ]
A.31
B.32
C.33
D.34
答案:C
— Look! The black clouds are gathering, which indicates that it __________ rain soon.
— Yes, black clouds are the _________ of the rain. [ ]
A. is going to; signal
B. will; mark
C. is gong to; sign
D. is to; sign