【题目】It is now ______ to see children playing traditional games，like hideandseek.They are attracted to online games.
A.informal
B.unusual
C.valuable
D.rare

【答案】D
【解析】A．informal非正式的；B．unusual不寻常的；C．valuable值钱的；D．rare稀少的；句意：现在很少(rare)会看到孩子们玩捉迷藏这样的传统游戏。他们现在都迷于网上游戏。根据句意，故选D。