短文改错

     If someone asks you how you can make you always happy, you will perhaps find rather difficult to

give him a proper answer. Do you remember the old saying "No human being can really be happy

which is not giving or trying  give happiness to others?" If you will always think of taking more from

others and giving them less, you won't be able to have happiness in your life even you are very rich.

Here is the article for you. If each of you follows it, your unhappy day will come to an end. So you

should learn to give out your own interests when necessarily.

水利水电工程的永久性水工建筑物的级别应根据建筑物所在工程的等别以及( )确定为五级。

A．建筑物的永久性

B．建筑物的重要性

C．建筑物的功能性

D．建筑物的地域性