单项选择题
A.Japan. B.America. C.India. D.Banglades
A.alert themselves to the approaching enemy B.emerge from water now and then to breathe C.be sensitive to the ever-changing environment D.avoid being swept away by rapid currents
A.The author has worked in China for 37 years. B.Cycling is not as safe as it was in the 1960s. C.The unique character of the old Beijing is disappearing. D.You cannot buy anything you like though you have money.