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【单选题】
在常用难认姓氏中，“单”的正确拼法应该是( )。A.
SHAN
B.
SAN
C.
DANG
D.
TAN
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反馈参考答案：
举一反三
【单选题】Chemical analysis depends on ( )
A.
chemical reaction
B.
molecular weight
C.
molecular forular
D.
instrument
【单选题】Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects
A.
28. Vitamin 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 return
D.
in short
【单选题】Vitamin 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
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