1 . 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_______”, 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 _______, wonderful things, but what Carla Chalmers did left everyone _______ 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 _______ On seeing this, everyone was filled with _______, 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) _______ 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 _______ on her face, and at that moment Carla took a photo, Carla’s photo came out of the camera immediately, and she _______ 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 _______
“Oh, so it’s…”
“Yes!” ________ Carla, opening the bag. “It’s a great big pile of smiles!”
She opened the bag and photos of different ________ fell out.
The rest of the class tried to ________ 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 ________, every person ________ with a smile of their own.
She managed to ________ understanding of the smile truth that every time you smile you are sending a gift to the world.1.

A．explorers

B．instructors

C．players

D．collectors

2.

A．regretful

B．delightful

C．stressful

D．thankful

3.

A．surprised

B．satisfied

C．annoyed

D．depressed

4.

A．disappointedly

B．sadly

C．amazedly

D．smilingly

5.

A．astonishment

B．kindness

C．expectation

D．pride

6.

A．expensive

B．old–fashioned

C．instant

D．good-looking

7.

A．disappeared

B．froze

C．faded

D．shone

8.

A．offered

B．sold

C．packed

D．paid

9.

A．box

B．bag

C．camera

D．pocket

10.

A．added

B．questioned

C．replied

D．interrupted

11.

A．smiles

B．teachers

C．ceremonies

D．friends

12.

A．try out

B．focus on

C．decide on

D．figure out

13.

A．imagination

B．expression

C．hesitation

D．reason

14.

A．responded

B．refused

C．demanded

D．proved

15.

A．hide

B．correct

C．appreciate

D．spread