下列气体与空气混合，遇明火可能发生爆炸的是（ ） A．氮气 B．氧气 C．二氧化

下列生产活动属于生产统计范围的有（）。

A.粮食

B.服装

C.运输服务

D.教育服务

E.家务劳动

闭合电路的一部分导体在磁场中运动的方向如图所示，图中小圆圈表示导体的横截面，箭头表示导体运动的方向，下列各图中不能产生感应电流的是

C

I have been employed by a charity organization for less than a year now and I have the privilege of finding foster homes for abandoned children. It has always been my dream to work with adopted children because I myself was an adopted child.

I was born in California in September of 1976 and was adopted in Ohio in March of 1977. I have no memory of being told that I was adopted, however, I have always known. I have been told that I was wanted and I was special.

Even though my parents provided me with lots of love, I was always annoyed by the questions about my origin and my feeling of being unwanted. I constantly scanned every crowd I was in for another human that looked like me or laughed like me.

I began searching for my birthparents in 1999 and I imagined every possible scene of my birth family.

I went to a local agency for support and five days later I met my birth mother. The story unfolded. She flew me to Los Angeles the next day and I spent the weekend connecting with another person who looked just like me. We have had a worthwhile relationship over the past years although she could not give me any information about my birth father.

In June of last year a member of my birth father’s family contacted me. Now, he and I are just beginning to get to know what it is like to be a birth child, Without the support of my parents who raised me I would have never experienced the feeling of being truly wanted accepted. For that, I am forever grateful.

64．What’s the author’s attitude towards working with adopted children?

A．He feels it is worth a try.

B．He is eager to work with them.

C．He is strongly against it .

D．He thinks it is painful.

65．How does the author feel about his birth family?

A．He feels that he can’t forgive his birth parents.

B．He understands his birth parents.

C．He misses his birth parents very much.

D．He is afraid of being hurt by them again.

66．Why does the author writes this passage?

A．To complain about being abandoned by his birth parents.

B．To show how deep his desire to work with adopted children is.

C．To encourage other people to find their birth parents.

D．To show his love to his birth parents and his foster parents.

患者，女，35岁。上颌第一磨牙缺失，牙槽嵴条件良好，拟行种植修复。

患者种植术后，不可能发生的并发症是（）

A.创口裂开

B.出血

C.下唇麻木

D.窦腔黏膜穿通

E.感染

《接触网运行检修规程》规定，昼间步行巡视的周期为（）。

A.5天

B.1周

C.10天

D.半个月