When I was young, I was always frustrated ( 挫败的 ), and almost everything ended in failure. I hung out everywhere all day. Having seen me like that, my father  小题1:   to cheer me up.

One day, he gave me a cup of water and asked me to taste it. I found it   小题2:  . My father said he just put one small spoonful of salt in the cup. And then, he led 小题3:   to a lake, where he threw a big handful of salt   小题4:  the lake, scooped up a spoonful of water and let me taste it again. He asked, "Does it   小题5:  taste salty?"'  "Not at all,"  I said. My father said,  "Now you may know the root (根源) of your  小题6:  :You are just a cup of water, not a lake. Be a lake and you won't小题7:sad any more."

I came to understand my   小题8:  motive (目的): I feel unlucky  小题9:  my heart is as small as a cup of water without great ideals as a lake.

To be a lake  小题10:  great ideals, your feeling of failures and frustrations will be melted ( 融化) like the salt thrown into the lake.

根据《建设工程安全生产管理条例》的规定，施工单位应当为施工现场从事危险作业的人员办理意外伤害保险，其保险期限自( )止。

A．建设工程开工之日至竣工验收合格
B．建设工程施工合同签订之日到竣工验收合格
C．建设工程开工之曰至竣工结算完毕
D．建设工程施工合同签订之日到竣工结算完毕