4．____ average we receive five e-mails each week．（　�。�
A．OnB．InC．WithD．At

分析 我們平均每周收到五封郵件．

解答 答案：A
解析：根據(jù)句意"我們平均每周收到五封郵件"及所給選項分析可知，本題考查on average"平均"這一固定短語．綜上，本題答案為A選項；其余選項均不符合用法．

點評 本題考查介詞短語的辨析，做此類題目時一定要清楚各個選項的含義及用法，再結(jié)合句意選出正確答案．

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