单项选择题

Questions 11 to 13 are based on the following passage.
After you have made purchases, you should

A. send an email to merchants.
B. look for more product information.
C. check confirmation emails.
D. change your credit card.
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单项选择题
When you are looking for a book you should write the following on slips EXCEPT
A. the pages of the book.
B. the call number of the book.
C. the title of the book.
D. the author of the book.
单项选择题
When money is involved, our relationship with others
A. will become stronger.
B. will be weakened.
C. will be clearly defined.
D. will remain the same.
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