The experiment with the dove indicates that _____()
A. A.birds have to be taught to navigate B.B.a bird that has been caged will not fly long distances C.C.some birds cannot fly at night D.D.some birds seem to follow the stars when they fly at night
To strengthen friendly relationship, people _____()
A. A.must hold friendship ceremonies B.B.have to eliminate differences in background C.C.should make friends with those who are of the same age and of the same race D.D.should support and understand each other through shared experiences and emotions