某合同采用抵押作为合同担保方式时，( )可以作为抵押物。
A．房屋
B．机器设备
C．债券
D．大型施工机具
E．股票
参考答案：A,B,E
–Don’t you think it a very nice motorbike?
--Yes, but would you please ____ it on my lawn?
A．not to park
B．not parking
C．not park
D．to not park
扇形都有______个角，角的顶点在______．
