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问题 单项选择题

直线x-2y+1=0关于直线x=1对称的直线方程是（）。

A.x+2y-1=0 

B.2x+y-1=0 

C.2x+y-3=0 

D.x+2y-3=0

答案

参考答案：D

解析：

数形结合，所求对称直线一定过点（3，0）、（1，1）。

单项选择题

One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (16) She cared for them and felt great love for them.

Once the (17) and per of the two birds flew from the cage. Therefore, (18) he flew close, she grasped him (19) She felt glad, but suddenly she felt the bird go limp. She opened her hand and (20) in horror at the dead bird.

She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (21) She lifted him from the cage and (22) him softly into the air. The bird circled once, twice, three times.

The girl watched delightedly at the bird’ s enjoyment. Her heart was no longer (23) with her loss. Suddenly the bird flew closer and (24) softly on her shoulder. It sang the sweetest melody that she had ever heard.

The fastest way to (25) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

23().

A.packed 

B.concerned 

C.marked 

D.lined
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单项选择题

根据《矿山生态环境保护与污染防治技术政策》，以下矿产资源开发活动不属于禁止的是( )。

A．在依法划定的风景名胜区、森林公园、基本农田保护区等区域内采矿

B．在铁路、国道、省道两侧的直观可视范围内进行露天开采

C．在地质灾害易发区开采矿产资源

D．土法采、选冶金矿和土法冶炼汞、砷、铅、锌、焦、硫、钒等矿产资源开发活动
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