单选题 It is thought that people can easily tell whether a person is a man or a woman from the clothes he/she wears. But now a lot of boys and girls in America are wearing the same clothes and many of them all have long hair. So it is often difficult to tell whether they are boys or girls.
One day, an old man went for a walk in a park in Washington. He felt a little tired, so he sat down on a bench(长凳). There was a young person standing on the other side of the pond(水池). "Excuse me," the old man said to the person next to him on the bench, "Do you see the person with the red trousers and long hair? Is it a boy or a girl?" "A girl," said the person next to him, "She is my daughter." "Oh," the old man said quickly, "I am sorry, but I didn"t know that you were her mother." "No, I"m not her mother," said the person, "I"m her father."

单选题 It isn"t often easy to tell whether many of American children are boys or girls, because ______.

单选题 One day, an old man went for a walk in ______.

单选题 There were ______ persons beside the pond, they are ______.

单选题 The young person standing on the other side of the ______ was ______.

单选题 The old man thought the person next to him was the girl"s ______.