分娩时形成子宫下段的部分是A．子宫体部 B．子宫角部 C．子宫颈部 D．子宫峡部 E

阅读理解。

     Everyone dreams of changing the world. But can teenagers really make a difference? And how can they go

about it?

      Michael Norton's book 365 Ways to Change the World is a good starting point. The book gives an idea or

task for every single day of the year. The tasks include volunteering at a local homeless shelter and planting a

tree.

     The book says that one simple act, no matter how small, can help someone in need. It may even influence

other teens to do something.

     Nathan Anthony, a student at Enochs High School in Modesto, Califomia, US, agrees. " It is impossible to

get anything in life without giving something to someone or making an effort at school or work," Anthony said.

     Another Enochs student, Ariane Mota, has the same opinion." Giving is our way of repaying those who help us," she said." Whether it is a helping hand or a donation, we should help others to improve their day or life."

      But how often do teens see peers (同龄人) helping a stranger or doing something nice for someone?

According to Anthony, not a lot. He and Mota both believe this needs to be changed.

     "I help my friends by reminding them that their lives are better than those less fortunate people," Anthony

said." Humor is also a great tool."

     So whether you're helping to find a cure (疗法) for cancer or simply smiling at a stranger, do something

every day to help change the world for the better.

1. What is the main idea of the passage?

A. Everyone should dream of changing the world.

B. Everyone is responsible for making the world better.

C. We should help others to improve their life.

D. Humor is a great tool to help people.

2. 365 Ways to Change the World is a book on ______.

A. small acts to change the world

B. the importance of changing the world

C. how to be a volunteer

D. how to plant trees

3. What opinion do Anthony and Mota have in common?

A. Give first if you want to get.

B. It is impossible to get anything in life.

C. Giving things to others means donation.

D. It is necessary to make others helpful.

4. The underlined word " this" in Paragraph 6 probably refers to____.

A. repaying those who help us

B. improving their day or life

C. teenagers not helping often

D. doing something nice for others

鉴定结论属于证据之一。

评定根管预备器械性能的指标如下，除外（）

A.穿透力

B.器械弹性

C.侧壁切割力

D.带碎屑能力

E.工作端的长短

迹线。