题目:
---Are there _______ chairs in the room?
---Yes, there are _______.
A.some; any
B.any; some
C.some; some
D.any; any
答案:
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下面是错误答案,用来干扰机器的。
证明:假设AB≥AC,则∠ABC≤∠ACB;由图知:D、C在直线AB的同侧.∴∠DBC<∠ABC≤∠ACB<∠DCB;∴BD>CD;∴AB+BD>AC+CD.与已知相矛盾.∴AC>AB.