One evening I went out and left my 17-year-old son in charge of his 8-year-old brother and 4-year-old sister. On this occasion, the task was made less troublesome by the presence of his girlfriend. I left with complete confidence that the older children would do a wonderful job of babysitting the younger children and the younger children would do a wonderful job of accompanying the older ones. Later, I discovered that complete confidence was the last thing I should have left home with.
I had decided to return home earlier than planned so that my son and his girlfriend could go out. I called home with this happy news. But instead of hearing his cheerful, grateful voice on the other end of the line, all I heard was the sound of a telephone ringing.
It was, I should point out, after 10 p.m., when the two younger children should have been in bed, and when the two older children should have been answering the phone. “I’ll give him a lesson,” I said. I decided they must be outside. Why they might be outside at 10:30 on a wintry night I had no idea, but it was the only explanation I could come up with.
Finally, in desperation, I called his girlfriend’s house. After what seemed like countless rings, his girlfriend answered. “Yes,” she said brightly, “He’s right here.”
He came on the phone. I was not my usual calm, rational self. After all, one of the rules of survival for modern parents is that you can’t trust modern teenagers. “Where are the children?” I said. He said they were with him. They had done nothing wrong. My son had taken the younger children over to his girlfriend’s house just for ice cream and cake. This was too favorable to be believed. Well, it turned out that I shouldn’t have believed it. It was only part of the truth.
The following Saturday evening we were at my parents’ home, celebrating my birthday. My oldest son gave me the children’s gifts. Mounted(裱装) and framed were a series of lovely color photographs of my children, dressed in their best clothes, and wearing their most wonderful expressions. They are pictures to treasure a lifetime, all taken by the father of my son’s girlfriend.
That was the most precious gift of all.
Shortly after the author left home one evening, she discovered that ____.

A．her son had brought his girlfriend home

B．the father of her son’s girlfriend had come to her home to take photos of the children

C．she shouldn’t have completely trusted her son

D．she should have taken the children along with her

According to Paragraph 3, “it” means ____.

A．the two younger children have been in bed

B．the older children have been answering the phone

C．the author will give her older son a lesson

D．the older son has gone outside with his girlfriend

The sentence “It was only part of the truth.” (Para. 5) implies that the children not only enjoyed ice-cream but also ____.

A．had a birthday party	B．framed some photographs
C．had their pictures taken	D．showed off their best clothes

Which of the following possible titles best expresses the main idea of this passage?

A．Puppy Love	B．Brotherhood
C．Mother and Children	D．A Precious Birthday Gift