第22题: [单项选择]The experiment with the dove indicated that ______. A. birds have to be taught to navigate B. a bird that has been caged will not fly long distances C. some birds cannot fly at night D. some birds seem to follow the stars when they fly at night 参考答案:D 答案解析:见第三段：Yet it showed an inborn ability to use the stars for guidance．其余三项无根据。
