题目内容
5．-How often do you exercise？？-___ a week．
| A． | Two | B． | Twice | C． | Second |
分析 -你多久锻炼一次？
-一周两次．
解答 答案：B
【解析】数词辨析．two二，为基数词；twice两次；second第二，为序数词．根据问句"你多久锻炼一次？"，所以应该用twice来回答，意为"两次"．故选B
点评 此题考查如何回答表频率的数词．一定要记住，回答表频率的数词，一定要用诸如once，twice，three times等表次数的表达去完成．注意不要和基数词和序数词相混．
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