单项选择题

The machine must be kept within a temperature range of 50 to 75 degrees Fahrenheit to achieve ______ performance.

(A) diverse
(B) optimal
(C) sequential
(D) relative
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单项选择题
Formal work attire has been mandated by management in order to foster an atmosphere of ______ in the office.
(A) hospitality
(B) morale
(C) immediacy
(D) professionalism
单项选择题
Celina was ______ for creating the advertising campaign responsible for a 220% jump in the sales of household cleaning products.
(A) ensured
(B) commended
(C) incorporated
(D) reprimanded
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