[单选题]依据《国家电网有限公司输变电工程施工分包安全管理办法》要求，输变电工程的主体工程不得进行（）。
A.分包
B.专业分包
C.劳务分包
D.自行施工

Letter One
Dear Sirs,
Your delay in delivering the carpets ordered on July 2nd is causing us considerable inconvenience, and it threatens the loss of one of our best customers, for whom they are intended.
We are likely to receive a standing contract from this order, but a delay in delivery might well prove fatal (致命的) to our chances. It is not enough, therefore, for you to inform us of the approximate date when delivery could be affected; we must insist on an unconditional guarantee that the goods will be delivered by July 13th. Further, it is important that you lose no time in conveying this information to us.
Yours sincerely
Letter Two
Dear Sirs,
It is with regret and a certain amount of surprise that we find you have not yet delivered the goods ordered two months ago.
As your representative’s promise to affect prompt delivery was an important factor in our placing this order with you, we must i

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 di