题目内容

物质的羧化过程离不开生物素和维生素B6。

A. 对
B. 错

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长期服用异烟肼的病人应注意适当补充维生素B6。

A. 对
B. 错

The deer has four __________.

A. foot
B. feet
C. foots

Her two brothers are both ________.

A. policeman
B. policemmans
C. policemen

The _ has two __.

A. boys, watchs
B. boy, watch
C. boy, watches