单项选择题

10．维生素C的主要降解途径是（） A.
水解 B.
异构化 C.
脱羧 D.
氧化 E.
聚合

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未分类题

The word 'unforeseen' (Line l)in Paragraph 3 means______.A.that have never been seenB.that have never been experiencedC.that cannot be acceptedD.that cannot be expected

A.A.that
B.that
C.that
D.that

未分类题

The thinking of a motion can be excited only when______.A.even persons are promoted to thinking beingsB.big and vital issues are widely debatedC.great thinkers have been brought upD.people allow themselves to think independently

A.A.even
B.big
C.great
D.people

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