The secret to the Jacket"s good looks is a special （）.
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The features of the Jacket include comfort, good looks, and protection for （）.
6（）
A. but
B. however
C. so
D. because
The market investigation is indispensable to sales promotion.
The writer wanted to resign because（）
A. he had serious trouble with his boss
B. he got underpaid at his job for the Globe
C. he wanted to be engaged in the new media industry
D. he had found a better paid job in a publishing house
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