I am angry about the behavior of dishonest in exams. I’m not saying that I’m a good student and that I’ve never cheated. I once write the answers on my hand for a history test but, unluckily, caught by my teacher. Because she was one of my most favorites, there were no words to describe how sorry I felt at once. I thought cheat would help me keep my straight A’s. Little I know that I was hurting not only herself but also my teacher. From this lesson I know our teachers want their students to succeed by learning with their own and do the best they can, not by cheating.

LED节能灯的特性是（）。

A．高效节能、发光效率高

B．健康、绿色环保、保护视力

C．技术先进成本低

D．超长寿命、安全系数高