单项选择题
Passage 2 Questions 13 to 15 are based on the passage you have just heard.
A．it is useful. B．It is harmful. C．It is a waste of time D．It is unnecessary.
A．it covers about half of the earth’s oceans B．the area of the Pacific is greater than Asia and Europe C．the influence of the icy Antarctic continent and the smaller ratio of land to sea increases water temperatures in the southern Pacific slightly in comparison with the northern Pacific D．most of the geologic activity of the Pacific occurs around its borders
A．murder B．shot C．fire D．betray