题目列表(包括答案和解析)
19.Vitamnin D helps our bodies make a special chemical,and this special chemical,----,
affects our brains,making us feel happy.
A.in turn B.in particular C.in advance D.in short
20 Helen devoted herself--to her research and became a top scientist in the field of applied
physics.
A.seriously B.extremely C.entirely D.strictly
18.Everyone must have known the death of the waitress,--?
A.must they B.mustn't they C.haven't they D.have they
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