单项选择题

A candy assortment consists of seven flavors of chocolate—covered creams packed in two—layered boxes with 27 creams in each layer．The flavors are always packed in rows so that the flavor varies with each piece in the following order：vanilla，orange，cherry，vanilla raspberry，lime，pecan， cherry，lemon． How many chocolate—covered vanilla creams are needed to pack 200 boxes of the assortment？（）

A. 600
B. 1，200
C. 1，800
D. 2，400
E. 3，600

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单项选择题
A certain company has found that the number of labor hours required to produce x items is directly proportional to the square root of x．If 3 labor hours are required to produce 20 items，how many labor hours are required to produce 40items？（）

A.A
B.B
C.C
D.D
E.E
单项选择题
A company paid $500，000 in merit raises to employees whose performances were rated A，B，or C．Each employee rated A received twice the amount of the raise that was paid to each employee rated C；each employee rated B received times the amount of the raise that was paid to each employee rated C．If 50 workers were rated A，100 were rated B，and 150 were rated C，how much was the raise paid to eachem ployee rated A？（）

A. $370
B. $625
C. $740
D. $1，250
E. $2，500
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