斯金纳认为行为分为两类，分别是（ ）。

(单选题)We may look at the world around us but somehow, we manage no (单选题)The theatre turned out to be ______ so few people go there; (单选题)There is something amazing in the Chinese that has stayed un (单选题)It’s strongly advised that smokers not be allowed to smoke i (单选题)Many parents receive a message about the class ______ becaus (单选题)In China the most ______ Spring Festival custom is making du (单选题)For the final ______ of our journey, we decided to take the (单选题)—I want to hire another manager for my company.—______, you’ (单选题)—What did Max just say to you?—He asked me ______. (单选题)—What shall we buy for Lucy as a present?—Let’s buy a new bi