G．S．PFormA是一种( )证明书。
A．品质证明书
B．普惠制产地证明书
C．重量证明书
D．动植物检疫证明书
参考答案：D
As the job-hunting season_________，many graduates are suffering from anxiety.
A．kicks off
B．takes off
C．puts off
D．sets off
大流动性混凝土
