题目

Her tears ______ fast when Margret heard of the bad news that her husband died in the battle against Iraq. A.flew                         B.flowed                      C.fled                          D.fell 答案：B 解析: flowed 流；flew 飞；fled 逃跑；fell 落下。只有flowed与fast连用。 使有意义的x的取值范围是________．