皮皮学，免费搜题
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【单选题】
检验因果假设最有说服力的一种研究设计是A.
实验性研究
B.
类实验性研究
C.
质性研究
D.
相关性研究
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：I really appreciate what you said and I believe you have a lot more to say on that topic. Let's explore the subject over lunch one of these days. (30)
A.
I don't think you have more to say on that topic.
B.
I think we'd better talk about that in detail sometime later.
C.
I am truly appreciative if you can elaborate on that topic after lunch.
D.
I am busy right now, so we might as well discuss it over lunch today.