0.5乘以一个小数，得到的积一定比0.5小．______．（判断对错）
0.5乘以一个小数，得到的积不一定比0.5小．
故答案为：错误．
试述现代教师的职业角色。
._______ there is going to be a policy change ________ of those things is going to change. [ ]
A. Unless; few
B. Until; few
C. Unless; none
D. Until; none
