The selection implies that human beings differ from computers in that human beings ().
A. make fewer errors
B. do not have to be programmed
C. work more quickly
D. understand their instructions
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The secret to the Jacket"s good looks is a special ().
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.