（）是钢的最重要的强化方法。
A.退火
B.正火
C.淬火
D.回火
参考答案：C
数轴上到数-1表示的点的距离为4个单位的点，所表示的数为 ______．
-Is your home __________ the park?
-No, it's __________ the park.[ ]
A. far to; near from
B. far from; near from
C. far from; near to
D. far to; near to
