新职工的“三级安全教育”是指（）。
参考答案：厂级教育、车间教育和班组教育
As the economy is getting better and better, there are more and more jobs _____.
A．valuable
B．previous
C．available
D．convenient
——Is this_____football, boys?
——No, it is not .
A．yours;ours
B．your;our
C．yours;our
D．your;ours
