题目

（2010·安徽师大附中高三二模）       29. —What do you think of Spain? —Well, considering its diverse cultures, it is an attractive country,______ worthy of a visit. A. it          B. one           C. this         D. that 答案：B3．两个等量点电荷P、Q在真空中产生电场的电场线（方向未标出）如图所示．P、Q 是两个等量异种（填“同种”或“异种”）电荷，P、Q 产生的是非匀强（填“匀强”或“非匀强”）电场．