问题
单项选择题
关于放射防护的方法和措施，下列哪一说法是错误的（）
A.简易的防护措施是进行距离防护
B.主动防护的目的是尽量减少X线的发射剂量
C.限制每次检查的照射次数是减少曝射量的重要措施
D.继发射线能量小，但对人体的危害也小
E.X线在一定的曝射量范围内对人体是安全的
答案
参考答案：D
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关于放射防护的方法和措施，下列哪一说法是错误的（）
A.简易的防护措施是进行距离防护
B.主动防护的目的是尽量减少X线的发射剂量
C.限制每次检查的照射次数是减少曝射量的重要措施
D.继发射线能量小，但对人体的危害也小
E.X线在一定的曝射量范围内对人体是安全的
参考答案：D
It was the end of my first day as waitress in a busy New York restaurant.My cap had gone away，and my feet were ____.The loaded plates I carried ____ to be heavier and heavier.Tired and discouraged，I wasn’t able to do anything ____.As I made out a check for a family with several children who had changed their icecream ____ a dozen times，I was ready to stop.Then the father ____ at me as he handed me my tip.“Well done，”he said，“you’ve ____ us really well.” Suddenly my tiredness ____.I smiled back，and later，when the ____ asked me how I’d like my first day，I said，“Fun！” Those few words of praise had ____ everything.Praise is like ____ to the human spirit；we cannot grow without it.And ___，while most of us are only too ____ to apply to others the cold wind of criticism，we are ___ to give our fellows the warm sunshine of praise.Why—when one word of praise can bring such ____？ It is strange how chary(吝啬的) we are about praising.Perhaps it’s ____ few of us know how to accept it.It’s ____ rewarding to give praise in areas in which ___ generally goes unnoticed or unmentioned.An artist gets admired for a glorious picture，a cook for a ____ meal.But do you ever tell your laundry manager how pleased you are when the shirts are ____ just right？In fact，to give praise ____ the giver nothing but a moment’s thought and a moment’s effort.
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