世界年降水量分布的一般规律是（　　）

A．靠近海洋的地方降水丰富，离海洋远的地方降水稀少

B．赤道附近降水多，两极地区降水少

C．南、北回归线附近的大洋西岸降水少，大洋东岸降水多

D．岛屿降水多，大陆降水少

To help a friend solve the problem troubling him,     .

A．a friend should be made known of his difficult situation

B．a man should be equipped with the kind of knowledge required

C．nothing is better than offering of knowledge required

D．keeping one’s promises is most important