按要求改写下列句子。

1. My sister is reading in her room. (就划线部分提问)

    ______ is ______ sister ______ in her room?

2. You can use my bike. (改为否定句)

    You ______ ______ my bike.

3. This is my favourite shop. (改为同义句)

    I ______ this shop ______.

4. He is passing the big store. (用often 改写句子)

    He ______ ______ the big store.

5. Mary is borrowing books in the library. (就划线部分提问)

    ______ is Mary ______ books?

男性，19岁。头昏、乏力、面色苍白1年，牙龈出血伴皮肤出血点1个月入院。化验：Hb60g／L，WBC3．2×10⁹／L，血小板30×10⁹／L，骨髓涂片确诊为再生障碍性贫血。

本例首选治疗是（）

A.雄性激素

B.氯化钴

C.泼尼松

D.脾切除

E.骨髓移植