_____,he can be fluent in English.    [ ]

A. Child as he is                                 

B. As he is a child    

C. As child he is                                  

D. Strange as is he

测定小麦种子的发芽率时必须选用合适的发芽床。适合小麦种子的发芽床有（）。

A.TP

B.BP

C.S

D.GA₃