阅读下面短文，掌握其大意，然后从21-30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
One day, Miss Ellis gave her pupils a new kind of homework: homework on happiness. Her pupils would be “happiness 1 ”, and were to see what would happen when they tried to bring happiness to those around them. As part of their homework, all the students did really 2 , wonderful things, but what Carla Chalmers did left everyone 3 . Several days after the homework had been handed out, Carla turned up carrying a big bag.
“Here in this bag I have all the happiness I’ve collected so far,” she said 4 . On seeing this, everyone was filled with 5 , but Carla didn’t want to show anyone what was in the bag. Instead, she pulled out a small box and gave it to her teacher. When Miss Ellis had taken the box, Carla took a(n) 6 camera out of her own pocket and stood with it at the ready.
“Open it, Miss Ellis.”
The teacher slowly opened the box and looked inside. A big smile 7 on her face, and at that moment Carla took a photo, Carla’s photo came out of the camera immediately, and she 8 it to Miss Ellis along with a sheet of paper. The teacher read the paper in silence, and when she, had finished, she gestured at the 9 .
“Oh, so it’s…”
“Yes!” 10 Carla, opening the bag. “It’s a great big pile of smiles!”
She opened the bag and photos of different 11 fell out.
The rest of the class tried to 12 how Carla had managed to create such a great big chain of happiness. All there in the box was a photo of a big smile. But everyone who had seen it felt happiness being transmitted（传送）to them, and in return, without 13 , every person 14 with a smile of their own.
She managed to 15 understanding of the smile truth that every time you smile you are sending a gift to the world.
【小题1】A．explorersB．instructorsC．playersD．collectors【小题2】A．regretfulB．delightfulC．stressfulD．thankful【小题3】A．surprisedB．satisfiedC．annoyedD．depressed【小题4】A．disappointedlyB．sadlyC．amazedly D．smilingly【小题5】A．astonishmentB．kindnessC．expectationD．pride【小题6】A．expensiveB．old–fashionedC．instantD．good-looking【小题7】A．disappearedB．frozeC．fadedD．shone【小题8】A．offered B．soldC．packed D．paid【小题9】A．box B．bag C．cameraD．pocket【小题10】A．addedB．questionedC．repliedD．interrupted【小题11】A．smiles B．teachersC．ceremoniesD．friends【小题12】A．try outB．focus on C．decide onD．figure out【小题13】A．imaginationB．expressionC．hesitation D．reason【小题14】A．responded B．refusedC．demanded D．proved【小题15】A．hideB．correctC．appreciateD．spreadD
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(答案→)D
解析：本文的主要内容是：Miss Ellis给学生们留作业，让大家收集快乐，Carla以一种独特的方式传递了自己对微笑的理解：那就是你的每一个笑容都是给世界的礼物。
【小题1】 根据“Here in this bag I have all the happiness I’ve collected so far,”，可知Miss Ellis给她的学生留的是让她的学生当幸福收集者，故选D。
【小题2】根据wonderful things，所以应该用delightful令人非常高兴的，故选B。
【小题3】根据下文Several days after the homework had been handed out, Carla turned up carrying a big bag. Carla的这一举动令大家很吃惊，故选A。
【小题4】结合下文She managed to spread understanding of the smile truth that every time you smile you are sending a gift to the world．故选D。
【小题5】 根据“Here in this bag I have all the happiness I’ve collected so far,” Carla这样说，所以大家满怀期待，故选C.
【小题6】根据下文Carla’s photo came out of the camera immediately可知是即时照相机，马上可以取出相片的相机,故选C。
【小题7】根据下文It’s a great big pile of smiles!可知笑容在老师脸上闪耀，故选D。
【小题8】结合上下文，她把相片给Miss Ellis故选A，offer 提供 sell卖 pack挑选pay 支付。
【小题9】根据下文Carla, opening the bag.可知Miss Ellis朝那个包做手势，故选B。
【小题10】根据上文“Oh, so it’s…”很明显Miss Ellis的话没有说完，被Carla打断了，故选D。
【小题11】根据“It’s a great big pile of smiles!”，故选A。
【小题12】根据All there in the box was a photo of a big smile. But everyone who had seen it felt happiness being transmitted（传送）to them, and in return, without hesitation ，可知这里想表达班里的同学们想弄明白Carla是怎样成功创造了如此多的快乐，try out实验 focus on致力于 decide on决定要 figure out弄明白，故选D。
【小题13】根据Carla’s photo came out of the camera immediately,可知没有迟疑，故选C。
【小题14】每个人都以他们自己的微笑作为回报，故选A。
【小题15】根据every time you smile you are sending a gift to the world.可知她在传递她对微笑的理解，故选D。