我国现行建筑安装工程费用项目组成中，直接工程费不包括( )。A．人工费 B．材料费

根据对话内容填入适当的词. (每空一词)

A: Let's __1__ the penguins.

B: __2__ do you want to see them?

A: Because they are very beautiful. They are my favorite __3__．

B: Well,  I want to see the __4__．

A: Why __5__ you like koalas?

B: Because they are cute.

He asked the students to be quiet so that he could hear what the speaker  _______. [ ]

A. had said

B. said

C. say

D. was saying

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产品的卖点也叫（）。

A.产品的特色

B.产品的名称

C.产品的用途

D.产品的价格

客户机与服务器交换数据前，先交换初始握手信息，在握手信息中采用了各种加密技术，以保证其（）和（）