Excel To SQLServer 2005

Hi, everybody

I have a problem when I try to import some test data from Excel to SQL Sever 2005.
My Excel file (Microsoft Office Excel 2003 SP2) contains the following rows:
Test data
1
2A
3

I use SQL Sever Import and Export Wizard from Microsoft SQL Sever Management Studio.

On the Choose a Data Source page, in the Data source list, I select Microsoft Excel and verify that the Excel version box contains Microsoft Excel 97-2005 and the First Row has column names check box is selected.
On the Specify Table Copy or Query page I select Copy data from one or more tables or views
On the Select Source Tables and Views page I select €˜Sheet1$€™ check box in Source column and write [MyTestDB].[dbo].[TestData] in Destination column. Click Edit Mappings..
On the Column Mappings page in Mappings table I see:
Test data Test data float €¦
I don€™t understand why I see float data type!!! It should be nvarchar (€¦).
OK, I change float to nvarchar (10) manually and click OK, Next and Finish.
After importing data is completed I go to the new table €œTest data€? and look at the imported data.
I don€™t understand again - why I see NULL instead of €œ2A€?.
So I have such data:
1
NULL
3

Can anybody help me how to get 2A instead of null?
Thank you.