实践是人类所特有的活动，具有客观物质性、能动性、社会历史性的特征。实践的客观物质

五（1）班有学生a人，五（2）班的人数是五（1）班的1.2倍．a+1.2a表示______．

Chinese athlete Liu xiang’s dropping out of the Olympic Games was really ______; it surely _____ the whole world.

A．astonished; astonished

B．astonishing; was astonished

C．astonishing; astonished

D．astonished; was astonished

Do you have fun _____ a kite, Danny? [ ]

A. flying

B. to fly

C. fly

D. to catch

干出礁高度从（）起算。

A.理论深度基准面

B.当地平均海面

C.平均大潮低潮面

D.理论大潮高潮面

阴虚火旺之心悸的临床特点是

A．心悸头晕，面色不华
B．心悸而烦，善惊痰多
C．心悸善惊，坐卧不安
D．心悸不宁，心烦少寐