题目内容：

The bus was full of the sounds of laughing and yelling fifth graders. They were on their way to the zoo for a class trip. Mario was excited to see the zoo, but there was one problem. It was ten o'clock in the morning, but his stomach was already grumbling(咕咕叫). He reached down and grabbed his lunch bag. Opening it, he saw that it contained a peanut butter and jelly sandwich, an orange, and two cookies. Mario sighed. He always had peanut butter and jell.

“Trade you lunches,” he said to the boy seated next to him on the bus．

“Okay,” said Mark as he handed his brown bag to Mario．

Mario opened it and was hit with the smell of tuna(金枪鱼). Mario wrinkled his nose and quickly closed the bag. He leaned forward and tapped the shoulder of the girl in front of him.” Swap lunches, Toni?” he asked．

“Hmm, okay,” said Toni．

Mario smiled. This was fun. But when he looked into the bag, he frowned. What a disappointment! A ham sandwich, but no cookies! He had to have cookies．

Mario turned in his seat. “Want to trade lunches?” he asked Juana．

“Definitely!” said Juana. She grabbed his lunch and tossed hers onto his lap．

He opened the lunch bag. Pizza! He reached into the bag to grab it. Oh, no! The pizza was hard. He could hit a home run with pizza that hard．

Mario twisted in his seat. One last try, he told himself. “Hey, Mona! Trade lunches?”

Three rows behind him, Mona seemed hesitant: Finally, she nodded. She passed her lunch forward, and he passed his back．

Mario took a deep breath and opened the bag. It was a peanut butter and jelly sandwich, an orange, and two cookies. The sandwich was a little squashed(挤压), and one of the cookies was broken.

Mario ate it anyway. And it was delicious.

1.Mario trade lunches so many times because ________.

A. each lunch he received was dissatisfying

B. his curiosity was aroused with each trade

C. he needed something interesting to kill time

D. he preferred more food to settle his stomach

2.In the underlined sentence (Paragraph 9), the author is comparing the pizza to ________.

A. left-over food    B. a baseball bat

C. home-made bread    D. a difficult game

3.What does the author intend to tell us？

A. Friends are there when you need them．

B. You should be content with what you have．

C. If you want something done right, do it yourself．

D. There is always something better around the corner．