单项选择题
Passage ThreeQuestions 33 to 36 are based on the passage you have just heard.
A．Follow policemen’s directions. B．Keep an eye weather. C．Avoid snow-covered roads. D．Drive with special care. 来
A．Their inadequate food supply. B．Unregulated commercial fishing. C．Their lower reproductively ability. D．Contamination of sea water
A. behaviors B. endeavor C. inventions D. element