短文改错。

     Good morning, everyone,

     It's great honor for me to speak here. My name's Li Xiaojun, born of a harmonious family. My father

and mother are all high school teachers. Influenced by them, I read widely during my early age, but I've

developed a great interest in arts and sports. I'm easy-going, get along well with my classmates.

     It is this personality which helps me win over all my classmates' friendships, and also help me overcome many difficulties both in academic and personal life. Being admitted in your university has always been a

beautiful dream for me. I dream constantly that I, along with mine classmates, will study happy with the

help of the respectable professors; I dream that I will swim freely in the sea, enjoying the waves of

knowledge.

     I hope all my dreams will come true in the near future.

     Thank you.

分子筛的主要特性有（）。

A.吸附力极强

B.选择性好

C.稳定性好

D.价格便宜