There are many types of enquiry including_（）
A. false enquiry
B. tentative enquiry
C. repeat enquiry
D. valid enquiry
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The basic structure of drafting an initial letter includes:_____（）
A. Introducing how you get the information
B. Your writing purpose
C. Your requirement
D. Your quotation
Choose the correct forms of Inside name and address（）
A. Sales ManagerOffice Systems Pty Ltd124 Oak StreetChatswoodNSW 2067Australia
B. George F. MooreAdvertising ManagerPrice & Patterson234 Seventh AvenueNew York 5, New YorkU.S.A
C. Mr. MooreAdvertising ManagerPrice & Patterson234 Seventh AvenueNew York 5, New YorkU.S.A
D. Mr. George F. MooreAdvertising ManagerPrice & Patterson234 Seventh AvenueNew York 5, New YorkU.S.A
Choose the correct forms of salutation in the business letter（）
A. Dear Mr. Smith
B. Dear John
C. Dear Sir/Madam
Dear Gentlemen
A key difference between calculating the sample mean and the population mean is（）
A. we use and n instead of μ and N
B. we divide the sum of the observations by n – 1 instead of n
C. the sample observations are ranked and the middle value is selected as the population mean
D. there are no differences
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