The purpose of this letter is to _____.

The purpose of a collection letter is to ( ).

A. persuade a customer to buy a product

B. give a discount to a potential customer

C. ask a customer to pay a past-due bill

Part A

51. Directions:

You are a senior of computer science. You'd like to be an intern for an IT company. Write a letter to present your willings including:

1) your education background;

2) your purpose of being an intern.

You should write about 100 words on ANSWER SHEET Ⅱ. Do not sign your own name at the letter. You do not need to write the address.

The purpose () this letter is to inform. you ()the important meeting.

A、to,of

B、on,about

C、of,of

D、of,on

The length of a letter does not depend on the subject of the letter.()

关于下面函数，哪一个是错误描述?defcount_letter_number(string):letter_count=0digit_count=0forchinstring:

if'a'<=ch<='z'or'A'<=ch<='Z':letter_count+=1elif'0'<=ch<='9':digit_count+=1

returnletter_count,digit_count

A.函数能统计字符串中英文字母出现的次数

B.letter_count+=1可以写做letter_count=letter_count+1

C.letter_count+=1可以写做letter_count++

D.函数能统计字符串中数字出现的次数

A business invitation letter serves the purpose of inviting a () to a party, an event or a celebration while conveying more information than a traditional invitations card.

A: host

B: guest

C: worker

D: collegue