任务型阅读

　　There are some students in front of the lost and found box. The duty monitor Alan is asking some questions.

Alan: Jim, is this your English book?

Jim: No, it isn't.

Alan: Linda, is this your English book?

Linda: Yes, it is. Thanks.

Alan: Gina, what colour is your pencil?

Gina: It's green.

Alan: Is this your pencil?

Gina: Yes, it is. Thank you.

Alan: What is your name?

Jenny: My name is Jenny.

Alan: Is your ruler green or yellow?

Jenny: It's green. There’s my name “Jenny” on it.

Alan: Oh, here you are.

Alan: Here’s a nice bag; whose bag is this?

Paul: Let me see. . .  Oh, it's mine.

Alan: Look at the cute doll. Is this yours, Mary?

Mary: No, it isn't. I think it’s Betty's. Is there a watch in it?

Alan: Sorry, I haven’t seen it so far.

根据对话内容, 完成以下任务。

完形填空

阅读下面短文。从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。

    Long, long ago, the Elephant had no trunk (象鼻). His nose was 1! But the Elephant's child, just a baby Elephant, was very curious(好奇的) and always asked silly2.

    One morning the curious baby Elephant asked the Kolokolo Bird, "What does the Crocodile3for dinner?" The Kolokolo Bird answered sadly, "Go to the banks of the green river if you want to4 the answer." After a long search, the baby Elephant found the Crocodile by the river bank. "I have been 5 you, Mr Crocodile!" he said excitedly. “Will you please6 me what you eat for dinner?" The Crocodile smiled and said, “Today I will begin with a baby Elephant!" And suddenly the Crocodile7him by the nose. The baby Elephant cried out through his nose. He sat back and began to pull as8 as he could. As he pulled, his nose began to stretch (拉长)! They both pulled and pulled until the baby Elephant was left with a very long nose! All the animals 9his nose. But then he found many ways to10it. He could pick fruits from high treetops, brush away flies, and even breathe when he was underwater!

器官移植的成功是人类医学的伟大成果，因为移植到人体内的器官很不易成活。根据现代免疫学的概念，植入人体的器官.组织细胞相当于____。

根据下列图示的探究过程，回答下列问题：