用科学记数法:-0.00214=( );0.0000214=( )。
-2.4×10-3;2.14×10-5
—What do you often do after school?
—I _____ basketball with my friends. [ ]
A. play
B. played
C. will play
D. are playing
日系相机追赶的过程有三个时期,其中包含的时期有()。
A、A
B、F
C、M
D、AF