原产于我国的青紫蓝兔是一种小型优质肉用兔种。( )
参考答案：错
鉴别原发性与继发性甲状腺功能减退症，应进行的检查是（）
A.TSH
B.FT3
C.FT4
D.TT3
E.TT4
There are so many new words in the text.You can _____ these words in the dictionary. [ ]
A. look after
B. look for
C. look up
D. look at
