Little Tom is an orphan.＿＿＿＿＿,he has to make a living by himself.

A．A child as he is

B．Child as he is

C．Child as is he

D．A child though he is

邻甲基苯甲酸（）有多种同分异构体，其中属于酯类的含有苯环的同分异构体有：                                                [ ]

A．6种        

B．2种         

C．4种         

D．5种