Mary, together with her parents, were into the deep forest in ______ search of rare plants when ______ three were exposed to a big bear.

A．the; the

B．/;the

C．/; /

D．the; /

统计调查中的采访法是根据（）的答复来搜集统计资料的方法，这种方法大部分通过被调查者填表法和口头问答来完成。