科学的职业分类是完善国家职业资格证书制度的重要基础工作。
参考答案：对
Nowadays, we still see some ________ begging for money in the street from ________.[ ]
A. woman beggars; passers-by
B. woman beggars; passer-bys
C. women beggars; passers-by
D. women beggars; passer-bys
当x=2时，代数式3x-4x2+7-3x+3x2+1的值是______．
