句型转换。

1. Mike went to Shanghai two days ago. (用in two days改写句子)

    Mike _____ to Shanghai _____ _____ .

2. My uncle will be back in six days.(对划线部分提问)

    _____ your uncle be back?

3. I saw you yesterday. You were going into the shop.(合并为一句)

    I saw you yesterday _____ you _____ into the shop.

4. You are not as popular as your best friend.(改为同义句)

    Your best friend is _____than you.

5. I don't know what I should say at the meeting.(改为同义句)

    I don't know _____  at the meeting.

铁和氧化铁的混合物共a mol，加 盐酸后固体全部溶解，共收集到b mol氢气，且向反应后的溶液中加入KSCN溶液不显红色，则原混合物中铁的物质的量为[ ]

A. 1/2(a+b) mol     

B. (a-b) mol        

C. 1/2(a-b)mol        

D. (a+b) mol