Computers_______ many things and we_______ these modern machines.
A：are used to doing; are used to use
B：are used to do; are used to using
C：used to do; are used to using
D：are used to do; used to use
一列火车每小时行120____．
一位勇敢的漂流者坐橡皮船在湍急的河水中漂流而下，下列说法正确的是（ ）
