—Are these your English books? —Yes .A. they’reB. they areC. these areD. they aren’t

问题补充：

—Are these your English books? —Yes, .

A. they’re

B. they are

C. these are

D. they aren’t

答案：

A. they’re

(答案→)B. they are

C. these are

D. they aren’t

解析：句意：这些是你的英语书吗？是的，它们是。在回答these提问时，用they回答，A在句末they are不能缩写；D的回答与前面矛盾，故选B。