一个整式与x2﹣y2的和是x2+y2,则这个整式是 [ ]
A.2x2
B.2y2
C.﹣2x2
D.﹣2y2
B.
—Could I borrow your dictionary?
—Of course you ______.[ ]
A. can
B. must
C. should
D. will
健康保险中都规定有免赔额条款,其中,单一赔款免赔额扣除的对象是()
A.每团体赔款
B.每次事故赔款
C.每年赔款总额
D.每个被保险人每年赔款