当事人对质量保证金赔偿决定不服的，可以在接到决定书之日起( )日内向上一级质监所提出申诉。
A．5
B．7
C．15
D．30
参考答案：C
What worried the child most was _____________ to visit his mother in the hospital.
A．to his being allowed
B．his not being allowed
C．not his being allowed
D．not his allowed
解方程
（1）x2+3x+1=0
（2）（x-2）（x-5）=-2．
