红皮病的病因与以下哪项无关：A．药物过敏 B．继发恶性肿瘤 C．银屑病发展而成 D．

In the following passage, there are 20 blanks representing the words that are missing from the context. You are to put back in each of the blanks the missing worD．The time for this section is 20 minutes.
Many things about language are a mystery, and many will always remain so. But some things we do know.
First, we know that all human beings have a language of some sort. (1) is no race of men anywhere on earth so backward that it has (2) language, no set of speech sounds by which the people communicate with one (3) . Furthermore, in historical times, there has never been a race of men (4) a language.
Second, there is no such thing as a primitive language. There are many people (5) cultures are underdeveloped, who are, as we say, uncivilized, but the (6) they speak are not primitive. In all known languages we can see complexities (7) must have been tens of thousands of years in development.
This has not (8) been well understood; indeed, the direct contrary has often been stateD．Popular ideas (9) the language of the American Indians will illustrate. Many people have supposed that the Indians (10) in a very primitive system of noises. Study has proved this (11) be nonsense. There are, or were, hundreds of American Indian languages, and all of them (12) out to be very complicated and very old．They are certainly (13) from the languages that most of us are familiar with, but they are (14) more primitive that English and Greek.
A third thing we know about language (15) that all languages are perfectly adequate. That is, each one is a perfect (16) of expressing the culture of the people who speak the language.
Finally, we (17) that language changes. It is natural and normal for language to change; the (18) languages which do not change are the dead ones. This is easy to (19) if we look backward in time. Change goes in all aspects of language. (20) features change as do speech sounds, and changes in vocabulary are sometimes very extensive and may occur very rapidly. Vocabulary is the least stable part of any language.

口语应用 在下列横线上填入适当的话语，使对话完整、正确。（共5小题，每小题3分，满分15分）

A: Hi，Alice! I’ve sent you an e-mail. Have you got it?

B:        小题1:              . I haven’t checked my e-mails today.

A: Why not?

B:                小题2:                    It doesn’t work.

A:           小题3:      

B: No, I can’t. It’s too old. My father wants to buy a new one for me.

A: That’s good news. You know, I’ve just got a new computer.

B:        小题4:       

A: I got it last week.

B: Where was it made?

A:              小题5:           

B: What? How would it be made in your home?

A: You see, my father bought different parts of the computer and then put them together. That’s how the computer was made in my home.

B: Aha, I see.

某项工程，业主与承包商签订了工程承包合同，合同中含有两个子项工程，估算工程量甲项为2300m³，乙项为3200m³。经协商，甲项单价为180元/m³，乙项单价为160元/m³。承包合同规定：

(1) 开工前业主应向承包商支付工程合同价的20%作为预付款；

(2) 业主自第一个月起，从承包商的工程款中按5%的比例扣留质量保修金；

(3) 当子项工程累计实际工程量超过估算工程量10%时，可进行调价，调价系数为0.9；

(4) 造价工程师每月签发付款凭证，最低金额为25万元；

(5) 预付款在最后两个月平均扣除。

承包商每月实际完成并经签证确认的工程量如表3-5所示。

[问题]

必须使用安全柄的锉刀（）

呼叫等待、呼叫保持能否实现三方通话？