不锈钢能够耐腐蚀的原因有（）个。
A.三
B.四
C.五
D.六
参考答案：A
一物体可以上下移动，设向上为正：①向上移动3m应记作______，②记作-1.5m表明______．
– The contest is drawing near, and I feel very nervous.
-- ______. So long as you try your best, it doesn’t matter whether you win or not.
A．Take your time
B．Take it easy
C．Don’t mention it
D．It’s hard to say
