解析：选A。由It will be hard for you to go to sleep tonight if you do可知，爸爸劝孩子别再喝咖啡，故用Better not (＝ You'd better not)表示委婉拒绝。

　　第二节：完形填空(共20小题；每小题1.5分，满分30分)

　　阅读下面短文，从短文后各题所给的四个选项(A、B、C和D )中，选出可以填入空白处的最佳选项。

　　We live in the countryside.My mother is a __36__ housewife.She takes care of a big family of 8, __37__ she has to go to the grocery store in the town at least once a week.One afternoon, she went to the grocery store in a hurry and __38__ a cart to feed our big family for the coming week.She had a number of errands (差事) to run, but when she __39__ buying everything she needed and pushed the cart out to the parking lot, she found she had __40__ her keys in the car.She called a locksmith (锁匠)，who __41__ the car door for her.After __42__ the locksmith a check, my mother got in the car and __43__ in a hurry as she had a lot of housework to do.

　　About ten minutes later, my mother suddenly __44__ that she had done something terrible — she'd __45__ to put her cart full of hundreds of dollars worth of groceries into the car before getting into the car.You know that was a __46__ sum of money for our family at that time.She hurried __47__ and looked everywhere for her cart of the newly­bought food.It was __48__ to be found, and she was sure it had been stolen by someone else.

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