先化简，再求值：3x2+2x-3(x2-13x)，其中x=-13．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题解答题

先化简，再求值：3x2+2x-3(x2-

1

3

x)，其中x=-

1

3

．

答案

3x2+2x-3(x2-

1

3

x)

=3x²+2x-3x²+x

=3x，

当x=-

1

3

时，原式=3×（-

1

3

）=-1．

完形填空

完形填空
Once there was a poor little girl living near a forest. She had no family and no one to love her. So she often   1  sad and lonely.
One day, when she was walking in the forest, she found that a small   2  was trapped unluckily in a bush. The butterfly tried to fly away   3  failed. The kind little girl saved the butterfly with great care. Instead of flying away, the butterfly turned   4  a beautiful fairy (仙女). The little girl was very   5 .
“Thank you for   6  me. You are so kind. I will make any of your dreams come true.” said the fairy.
The little girl thought for a moment and then said, “I want to be 7 !”
The fairy said, “Very well. I will help you.” And she said something in the little girl’s ear. Then the fairy disappeared.
As the kind little girl grew up, she was   8  ready to help people in need and was popular among the villagers. No one in the village was as happy as she was. Everyone asked her the   9  of ther happiness. She always smiled and   10 , “The secret of my happiness is that I listened to a kind   11  when I was a little girl.”
When the kind girl became a very old woman and was dying, the neighbours in the   12  all gathered (聚拢) around her bed because they were   13  that her secret of happiness would die with her. They asked, “Please tell us what the kind fairy said.”
The lovely old woman still   14  and said, “She told me that everyone needed me, no matter how safe they seemed, no matter how rich or poor, no matter how old or   15 . She said that helping others would make me happy all my life.”

单项选择题

女性，出生7d。母亲代诉患儿烦躁不安、啼哭，拒绝进食。口腔检查见左颊部及舌尖部有散在分布的雪白色柔软小斑点，基底黏膜充血明显。稍用力可擦去，留下出血的糜烂面。初步诊断为

A．急性假膜型念珠菌口炎

B．急性红斑型念珠菌口炎

C．慢性肥厚型念珠菌口炎

D．慢性红斑型念珠菌口炎

E．念珠菌性唇炎