下列函数中不是二次函数的是（　　）

A．s=1+t+5t²

B．y=2²+2x

C．y=-2+3x²

D．y=100（1+x）²

As usual，we are going to insure against（）for 110% of the invoice value.

A.order

B.All Risks and War Risk

C.you

D.shipment