The tape recorder can be a very effective aid to teaching if it is used appropriately.
为了能轻松地解决那问题，我们采取了一些明智的措施。
What"s the meaning of the word "defection" (Last Line, Para. 6)（）
A. Customers" betrayal.
B. Service defects.
Customers" protection.
D. Service advertising.
According to the author, when you do a really outstanding job in service, you will（）
A. build a bad reputation
B. break the link with your customer
C. get a positive word-of-mouth advertising for your business
D. earn big money
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