Big or small?

　　Mrs．Black has two daughters．On Sunday morning, when she is doing her housework, her younger daughter comes and asks for some money to buy some sweets．

　　”Sweets are bad for your teeth．” Mrs．Black says．”Please take two apples and give one to your elder sister．” One of the two apples is much bigger than the other one, so the younger girl keeps the bigger one for her and gives his sister the smaller one．

　　When Mrs．Black’s elder daughter sees that her sister has a bigger apple, she says to her sister, “It’s selfish to take the bigger one for you．If mother gives me two apples, I will give you the bigger one．”

　　”I know you will, and that is why I take the bigger one!” the girl answers．

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