单选题 Until recently, such ______ was limited to telephone questions and answers much like daytime talk shows.

【正确答案】 B

【答案解析】[注释]此题不但要从语句的结构上考虑，还要看其语义关系。因句内存在“交互作用”的含义，需要选择[B]为最佳答案。