句型转换，每空一词。 

1. His ruler is in the box. (对画线部分提问)

    ___    ____ his ruler?

2. This room is Lucy and Lily's. (改为选择疑问句)

    _ _     this room Lucy's ____ Lily's?

3. Is he your friend? (改为复数)

    ___    ____ your ____?

4. These are our apples. (改为单数)

    ___    is ____ ____. 

5. The boy is all right today. (对画线部分提问)

    ___    ____ the boy today?

6. They can see a bird in the tree. (对画线部分提问)

    ___    ____ ____ see in the tree?

贫血患者HGB50g／L，WBC4．8×10⁹／L，PLT120×10⁹／L，网织红细胞2％，红细胞平均体积76fl，平均血红蛋白浓度（MCHC）0．24，血清铁蛋白7．8μg／L，最可能的诊断是（）

A.甲状腺功能减退所致贫血

B.再生障碍性贫血

C.溶血性贫血

D.缺铁性贫血

E.巨幼细胞贫血