想一想，选一选。

1. 图图问妈妈他可以吃些鱼吗，他应说： [ ]

A. Can I have some fish?

B. May I sit here?

2. 精灵兔想问小天家里有几口人，它应说：[ ]

A. How many books do you have?

B. How many people are there in your family?

3. 丁凯乐想问胖哥的钢笔在哪儿，他应说：[ ]

A. Where are your pens?

B. Where is your pencil?

活化的T细胞表达的抑制性受体是（）。

A.CTLA-4

B.TCR-Igβ

C.FCR

D.CD94

E.IL-2R