C

　　It was Sharing Day! The teacher had asked the students to bring something interesting to class.

　　Jimmy found the little box he and Dad had made. Inside was a piece of rock, a sand dollar and a shark (鲨鱼) tooth. Nobody could have anything as interesting as these !

　　In class, Jimmy waited anxiously, hoping to be called on first by the teacher. But Kara was first. She held up a sand dollar. Jimmy’s eyes grew big.

　　“I found this on the beach,” Kara said. “It’s interesting. The little holes that make the sand dollar look like a flower are breathing holes. See all the needles? They help the sand dollar move and dig into the sand.”

　　Jimmy was a little uneasy. Oh, well, he still had his rock and shark tooth.

　　Then Mark stood up. “This is my favorite rock, called pumice (浮石).” Then Mark dropped the rock into a glass of water. “Look! Pumice is the only rock that floats !”

　　Jimmy put up his hand and waved, but the teacher called on Justin instead.

　　“I found this shark tooth in Hawaii last Christmas,”Justin said.

　　The class was excited, but Jimmy lowered his head.

　　“Sharks have rows of teeth. Every time a shark loses a tooth, another one takes its place.” Justin passed the tooth around.

　　Jimmy heard the teacher call him. He stood on one foot and then the other. “Well, ah, see…my treasure box is interesting! It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It smells good, reminding us of camping.”

　　“What’s inside?" asked Lisa.

　　Jimmy opened his box. “A sand dollar, a piece of pumice and a shark tooth.”

　　His classmates’ mouths dropped open. The teacher looked at the objects in the box and smiled. “Now that’s interesting!” he said.

　　43. On the Sharing Day, Jimmy ______.

　　A. bought a treasure box to hold his interesting things

　　B. enjoyed the things others brought to the class

　　C. waited patiently to be called on by his teacher

　　D. wished to be the first to share his possessions

　　44. What does a sand dollar look like according to Kara?

　　A. A hole. B. A needle. C. A flower. D. A tooth.

　　45. Who shared with the class a rock that floats?

　　A. Lisa. B. Kara. C. Justin. D. Mark.

　　46. How did Jimmy’s classmates feel when they saw the things in his box?

　　A. Disappointed. B. Surprised. C. Anxious. D. Uneasy.

　　43. D。

　　解析：事实细节题。根据第三段可知,课堂上，吉米焦急地等待着，希望老师能第一个叫他来分享自己的东西。故本题选D。

　　44. C。

　　解析：事实细节题。根据第四段可知，卡拉提到她在沙滩上找到了一个海胆，海胆上的小洞洞让海胆看起来像一朵花，这些洞洞是海胆的呼吸口, 海胆上的针状物帮助海胆移动，并钻进沙子。故本题选C。

　　45. D。

　　解析：事实细节题。根据第六段可知，马克站了起来，分享了他最喜爱的石头——浮石。故本题选 D。

　　46. B。

　　解析：推理判断题。根据最后两段可知，当马克打开了他的盒子的时候，同学们不由得张开了嘴巴。由此可知，同学们张开嘴巴这一举动表示他们很惊讶。disappointed 失望的;surprised惊讶的;anxious焦虑的;uneasy不安的。故本题选B。