____conventional black ink costs newspapers about thirty cents a pound, most rub-resistant inks add at least ten cents more per pound to the bill.
(A) Furthermore
(B) Meanwhile
(C) Moreover
(D) While
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答案：D
测试点：连词.分析：本题为两个完整的句子，其意义相互对比，应用连词 while 连接．(A)、(B)、(C)均是副词.解题要点：4 个答案中如有 while，应首先考虑它。