, then the final value of,is
A、1
B、0
C、does not exist
D、-1
第3题
A.Visiting suppliers.
B.During production.
C.Chemical analysis.
第6题
A.The business.
B.The advertiser.
C.The employee.
D.The consumer.
第7题
B. Two weeks before the final due date.
C. By the end of the term.
D. A week after the last class.
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