It shows that____ knowledge of first aid can make a real difference.
A．a(chǎn)B．theC．oneD．/
A
考查冠詞和代詞。句意“這證明掌握急救知識(shí)可以有很大幫助。”a knowledge of...“關(guān)于......的知識(shí)”，是固定搭配。故選A。
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