【单选题】People do not analyse every problem they meet. Sometimes they try to remember a solution from the last time they had a【C1】______ problem. They often accept the opinion or ideas of other people. Other ...
【单选题】Scientists have wondered for a long time if animals can learn to talk as human beings do. Several years【C1】______ , two psychologists took a baby chimpanzee into their home and raised it as a member o...