Buffy has a pile of six clean shirts on her bed. She wants to put them away in her four drawers.巴菲在床上放着一堆六件干净的衬衫。她想把它们收进她的四个抽屉里。
She takes one shirt at a time from the pile and puts it into a drawer. Buffy starts with the top drawer, then uses the second from the top, and works her way down. When she has put a shirt into the bottom drawer, she starts again from the top.她每次从那堆衬衫里拿一件放进抽屉里。布菲从最上面的抽屉开始，接着用从上往下数第二个抽屉，然后依次往下放。当她把一件衬衫放进最下面的抽屉后，又从最上面的抽屉开始放。
Into which drawer will she put the last shirt? Click on the drawer to open it.她会把最后一件衬衫放进哪个抽屉里？点击抽屉将其打开。
(Click 'Save' when you have chosen the correct drawer.)（选好正确的抽屉后点击“保存”。）
Explanation 解释
Answer: 答案:
Buffy puts the first shirt in the 
drawer.
The second shirt gets put into the 
drawer.
Then the third and fourth shirts get put into the 
and 
drawers.
Since the drawer is the bottom drawer, the fifth shirt gets put into the drawer again.
Finally the sixth shirt gets put into the drawer .
巴菲把第一件衬衫放进抽屉里。最后第六件衬衫被放进了抽屉里。第二件衬衫被放进了抽屉里。然后第三件和第四件衬衫被放进抽屉里。由于抽屉是底层抽屉，所以第五件衬衫又被放回了抽屉里。
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