12．The Australian boy has a good ______ of Chinese and can express himself freely in it．（　�。�
A．powerB．commandC．demandD．usage

分析 這個澳大利亞男孩精通漢語，能夠自由地用漢語表達(dá)自己．

解答 答案：B．
本題考查固定短語．have a good command of sth精通某事；power全力，力量；demand需求，需要，要求；usage用途；故選B．

點(diǎn)評 本題考查常見的名詞短語．考生在平時要多積累名詞短語．

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