当动物缺乏此维生素时表现为生长受阻、皮炎、癫痫样抽搐、贫血和色氨酸代谢受阻等,此维生素为()
A.维生素B1
B.维生素B2
C.维生素B6
D.维生素D
E.胆碱
参考答案:C
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽,33)
A.that
B.how
C.who
D.what
每年7月11日定为“_____________”。