题目

50. Teachers should be _____ with their students but should not be _____ on them. A. hard; strict               B. strict; hard                C. hardly; strictly          D. strictly; hardly 答案：B某学生将3.5．6乘以一个数a时，把3.5．6看成3.56，使乘积比正确结果减少0.02．则正确结果应该是______．