网址：http://m.1010jiajiao.com/timu_id_2366893[举报]
— Is this a key? — ________ .
A. No, it isn’t. B. It’s a ruler C. Yes, it’s D. OK
[ ]
---- Is this a key?
---- ________ .
－Is this a key?
－________．
A．No, it isn't．
B．It's a ruler
C．Yes, it's
D．OK