单选题 By placing more ______ on the quality control, NS Electronics has made its new copier one of the best sellers this year.
【正确答案】 B
【答案解析】[解析] 单词形态：名词
1．这是一道单词形态题，选项均为emphasize的不同形式。
2．空格内须填入名词作及物动词place的宾语，B．emphasis为正确选项，-sis是名词性后缀。