回归测试是下列哪项维护工作中最常用的方法A．适应性维护 B．校正性维护 C．完善性维

It was Mother's Day，but the young mother was a little unhappy，because she was 800 miles away from her parents．In the morning she phoned her mother to wish her a happy Mother's Day，and her mother told her about the beautiful lilacs（丁香）in the garden．

Later that day，when she told her husband about the lilacs，he said，“I know where we can find all that you want．Get the children and come on．”So they went，driving down the country roads．

There on a small hill，they saw a lot of beautiful purple lilacs．The young woman ran quickly to enjoy the flowers．Carefully，she picked a few here and a few there．On their way home there was a smile on her face．

When they were passing a nursing home（养老院），the young woman saw an old granny sitting in a chair．She had no children with her．They stopped the car and the young woman walked to the old woman，put the flowers in her hands，and smiled at her．The old granny thanked her again and again．She smiled happily，too．

When the young mother came back to her car，her children asked her，“Who is that old granny？Why did you give our flowers to her？”

“I don't know her，”their mother said．“But it's Mother's Day，and she has no children．I have all of you，and I still have my mother．Just think how much those flowers meant to her.

小题1:The young woman was a little unhappy on Mother's Day because _____.

A．she didn't have a present

B．she was a long way from her mother

C．she didn't know it was Mother's Day

D．she wanted to see her father小题2:There were many beautiful purple lilacs.

A．in her garden

B．in the market

C．in her mother's garden

D．in the nursing home小题3:The young woman had __________.

A．one child

B．no child

C．more than one child

D．a boy and a girl小题4:The young woman gave the flowers to the old granny because ________.

A．she was her mother

B．she didn't like those flowers

C．her mother asked her to do so

D．she wanted the old granny to be happy，too小题5:Which of the following is NOT true？

A．The young woman was kind.

B．The young woman was understanding.

C．The young woman was friendly.

D．The young woman was surprised.

年轻恒牙深龋保留部分龋坏牙本质的目的是

A．观察牙髓状况

B．促进牙本质形成

C．杀灭细菌

D．保护牙髓

E．再矿化

穿提升大绳，爬井架的人必须系好安全带。

以下哪几种存放方法对胶芯最好（）

A、靠近有腐蚀性的物品

B、在光线较暗又干燥的室内

C、接近高压带电设备

D、单个平放

E、室温状态

热力膨胀阀的安装位置应( )感温包。

A．高于
B．等于
C．低于
D．不高于