单项选择题
A．underground is convenient B．the advantages of underground C．we can have good food underground D．you can spend the night underground
A．Birds hardly pay attention to their young. B．Baby crocodiles can look after themselves well. C．Some dinosaurs took care of their young. D．Birds and crocodiles take good care of their youn
A．British painters B．golden jewelry C．a modern treasure hunt D．writing children’s books