句型转换。

1. Mary hasn't been to Dalian. I haven't been to Dalian, either. (改为同义句)

          Mary        I          been to Dalian.

2. Tom is the tallest boy in his class.  (改为同义句 )

   Tom is taller than                          in his class .

3. Linda hasn't been to Wuhan. I haven't been there, either.  (政为同义句 )

   Linda hasn't been to Wuhan.                   .           .

4. She's been to Qingdao tw ice. ( 对画线部分提问)

                                has she been to Qingdao?

5. Mr. Smith has finished his work already. (改为疑问句)

           Mr. Smith finished his work          ?

金属原子在二维空间里的放置有下图所示的两种方式，下列说法中正确的是

A．图(a)为非密置层，配位数为6

B．图(b)为密置层，配位数为4

C．图(a)在三维空间里堆积可得镁型和铜型

D．图(b)在三维空间里堆积仅得简单立方