A:C2040a 和 A1840r
B:D和T
C:H2O和H2O2
D:O3和O2
—It's ninety-nine yuan.
The question of __________ English will keep on changing in the future is easy __________ since it is certain that this process will continue.
读图回答.
真的,巴尔扎克说得好:____。