单项选择题

（）is related to illness is not a new discovery．

A.The food
B.That food
C.What food
D.Which food

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He likes to leaf（）his picture albums when he is free at home.

A.out
B.through
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lt is high time that you（）harder for the exam.

A.study
B.had studied
C.studied
D.were to study
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