下列说法不正确的是（） A．等边三角形只有一条对称轴 B_爱下问搜题

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问题选择题

下列说法不正确的是（　　）

A．等边三角形只有一条对称轴

B．线段AB只有二条对称轴

C．等腰三角形的对称轴是底边上的中线所在的直线

D．等腰三角形的对称轴是底边上的高所在的直线

答案

A、等边三角形有三条对称轴，故选项错误；

B、线段AB有线段AB本身所在的直线和线段AB的垂直平分线二条对称轴，故选项正确；

C、等腰三角形的对称轴是底边上的中线所在的直线，故选项正确；

D、等腰三角形的对称轴是底边上的高所在的直线，故选项正确．

故选A．

完形填空

IMAGINE a life without arms or legs! You can’t hold anyone in your 26 . You can’t walk anywhere with your feet. How would you last a day like that? Would you 27 at yourself in the mirror like Nick Vujicic, the 29-year-old Australian?
Nick was born without limbs（四肢）, so life was not 28 for him. At school many students played jokes on him 29 he looked different from everyone else. He was refused to be 30 friends, so he always felt 31 . However, he faced that bravely. He 32 to type and write with two toes（脚趾）at the age of six, and he could 33 s

urf and play golf. In college, he achieved great success and was among the   34  students in the studies. And he decided on   35  to do later in his life—to encourage others to work hard for their dreams.
Now Nick is one of the most popular   36  in the world. He travels to many countries and gives speeches about his story   37  difficulties. “Living life fully is about looking at what you   38 , not what you don’t have.” he said. His   39  encourages millions of people.
“I tell people to keep on getting up when they   40  and to always love themselves,” he said. “If I can encourage just one person, then my job in this life is done.”

单项选择题

一个物业管理区域只能成立一个业主大会，一个物业管理区域由一个物业管理企业实施物业管理，这主要体现了物业管理的( )原则。

A．专业高效

B．统一管理

C．公平竞争

D．服务第一