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Education PaysAs is shown in the graph, among those with doc......

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单项选择题
56（）

A.appealing
B.average
C.conflict
D.currently
E.elementary
F.ensure
G.female
H.fill
I.occupations
J.occurring
K.positions
L.primary
M.recession
N.regularly
O.unusual
单项选择题
Why do some researchers think sugar should be considered a controlled substance （）

A．It contains nothing but empty calories.
B．It is as harmful as morphine and heroin.
C．It works the same way as alcohol and tobacco in the human body.
D．Excessive intake of sugar results in liver toxicity and various diseases.
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