2002 AMC 8 第 6 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
6.
一个鸟浴盆被设计成会溢流，从而可以自我清洁。水以每分钟 毫升的速度流入，以每分钟 毫升的速度排出。下列某个图显示了鸟浴盆在注水阶段并继续到溢流阶段的水量。是哪一个？
A birdbath is designed to overflow so that it will be self-cleaning. Water flows in at the rate of milliliters per minute and drains at the rate of milliliters per minute. One of these graphs shows the volume of water in the birdbath during the filling time and continuing into the overflow time. Which one is it?
答案：A
解答：
鸟浴盆溢流前，每分钟净增加 毫升水，所以水量稳定上升。
鸟浴盆装满后，流入的多余水会溢出，所以水量保持不变。只有图 A 显示先上升再水平的图线。
所以正确答案是 A。
Before the birdbath overflows, it gains milliliters of water per minute, so its volume increases steadily.
Once the birdbath is full, the incoming extra water overflows, so the volume remains constant. Only graph A shows an increasing line followed by a horizontal line.
Thus, A is the correct answer.
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