—You'd better take good care of her so that she can get well very soon.
A:is busy
B:is sick
C:is old
若甲、乙二地的图上距离为2厘米,则实际距离为( )
词汇:根据音标或汉语意思提示完成句子。
Our teachers taught us to sing ____ (活泼的) songs before class.
运送飞船的火箭常用液态肼(N2H4)和液态双氧水(H2O2)作推进剂,若它们充分混合反应,其化学方程式为:N2H4 + 2H2O2= X + 4H2O,则X是()