骨质疏松的表现有骨痛、肌无力、驼背和骨折。

小明到伊朗游历时，在前往首都德黑兰的大道旁边离地150米的大岩石上，见到了一种奇怪的、从未见过的字体。这种字体是

A．象形文字

B．楔形文字

C．甲骨文

D．金文

甲国和乙国均为《联合国国际货物买卖公约》(本题中以下简称《公约》)的缔约国，则根据《公约》的规定；下列买卖交易不适用《公约》的有：

A．营业地在甲国A公司通过在拍卖行竞拍买得营业地在乙国B公司的一批货物

B．营业地在甲国A公司为营业地在乙国B公司加工生产了两艘万吨油轮，并按期交货

C．营业地在甲国A公司将所持有的乙国B公司的股票转让给丙国C公司

D．营业地在甲国A公司将一批残次服装出售给营业地在乙国的B公司

 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

A:       61      .

B: I think so. You see, many students are going into and coming out of that building. Most of them  

are holding books or carrying schoolbags. Let’s go in and have a look.

A:       62      .

B: You really don’t have to worry about that. We can ask the assistants for help. Besides, you can      

always find rules posted on the walls of the library.

A:       63      .

B: Sure, and it must be shown each time. We can also read newspapers and magazines in the         

rooms there.

A:       64      .

B: Of course. That’s one of the purposes of the library.

A:       65      .

B: I guess since we’re both new on the campus, we have many questions. As a matter of fact, I   

don’t know any more about this than you do. Let’s go in and find out.

A．Look, the students are very busy.

B．I’ve never been to a library; I don‘t know what to do.

C．Can we read our own books there?

D．Let’s ask the assistants who can help us.E. If we borrow books there, how long can we keep them?

F. That big building must be the library.

G. I hear we’ll be given a library card, with which we can borrow books.

总体应该由（）

A．研究对象组成

B．研究变量组成

C．研究目的而定

D．同质个体组成

E．个体组成