单选题 The combination of ______ and emotional interactions with infants is crucial to their learning and emotional development.

【正确答案】 A

【答案解析】intellectual智力的；integrated整体和谐的；intelligent有理解力的；intelligible(尤指语言或文字)可了解的。句意：和婴儿进行情感与智力相结合的交流对他们的学习和情感的发展是至关重要的。