题目内容
（请给出正确答案）
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
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更多“The purpose of a collection le…”相关的问题
若矩阵D的行向量线性无关，则对一切可乘矩阵B，均有col(B)=col(BD)．
若有可乘矩阵B使得col(B)=col(BD)．则矩阵D的行向量线性无关？
A good title for this passage is ______ .
A．Getting Blood and Plasma
B．Special Blood and Colors
C．Human Blood Types
D．The Blood Bank of a Hospital
A.表格中可以包含TBODY元素
B.表格中可以包含CAPTION元素
C.表格中可以包含多个TBODY元素
D.表格中可以包含COLGROUP元素
E.表格中可以包含COL元素
What can be said about the acrobatic show？
A．When you watch it, you will certainly feel cold.
B．Something strange will puzzle everyone, including scientists.
C．Unexpected things will make you excited and surprised.
D．Even the bravest ones will be too frightened to go on watching.
Tenor is concerned with the purpose and subject-matter of communications.()
