已知△ABC内接于⊙O，AB=AC，半径OB=5cm，圆心O到BC的距离为3cm

根据短文内容，从下框的A～E项中选出能概括每一段主题的最佳选项，选项中有一项为多余项。

A. Gift giving proven(证明) to be valuable.

B. Memories from gift giving.

C. Moments and events for gift giving.

D. Various functions(功能) of gift giving.

E. Gift giving as a two-way(双向的) social activity.

Gift Giving

小题1:________

There are many occasions (场合) for giving gifts in modern societies: birthdays, naming ceremonies（庆祝仪式）, weddings, anniversaries（周年纪念日）, New Year. People often give gifts on many of these celebrations in western countries. Sometimes special events, such as one’s first day of school or graduation from university, often require gift giving.

小题2:________

What is happening when we give gifts? Most important, we are exchanging gifts. If someone gives me a gift for my birthday, I know that I should give one on his or her next birthday.

小题3:________

Gifts tighten(使紧密) personal relationships and provide a means of communication between loved ones. People say that a gift lets the recipient (接受者) know we are thinking of them, and that we want to make the person “feel special. ”We want people to feel wanted, to feel part of our social or family group. We give presents to say “I’m sorry.”

小题4:________

People tend to talk about presents in a fairly loving way. A woman whose mother had died years ago described the many gifts around her house. These were gifts that her mother had given her over the years: “I appreciate these, and they mean something to me,” the woman said, “because I remember the occasions they were given on, and that they were from my mother, and the relationship we’ve had. ” The gifts remain and keep the relationship alive in mind. This woman felt the same way about the gifts she gave to others. She hoped that the recipients would look at her gifts in years to come and remember her.

镍铬合金铸造时，包埋材料应用

A．正硅酸乙酯包埋材料

B．二氧化锆类包埋材料

C．石膏类包埋材料

D．硅溶胶包埋材料

E．磷酸盐类包埋材料

准公益类事业单位

施工项目成本控制是企业全面成本管理的重要环节，应贯穿于施工项目（）。

A.从筹建到竣工的全过程

B.从招标到竣工的全过程

C.从投标到竣工的全过程

D.从开工到竣工的全过程

游标卡尺按其读数值可分为（），0.02mm和0.05mm三种。

A、0.01mm

B、0.1mm

C、0.2mm

D、0.5mm