Water _________ in seas, rivers and lakes.

The UK is bordered by three seas and one ocean.

According to the passage, it is clear that the force of the moon ______. A: is not as important as that of the wind B: is less than half that of the sun C: is the primary cause of the alternate rise and fall of the surface of the seas D: does not influence the rise and fall of the surface of the seas

Among the four seas off the coast of China, East China Sea is the second______.

中国大学MOOC: ________ and Gaea generate everything that exists, including seas, mountains, gods and monsters.

Blue Ocean refers to A: Unexploited opportunities B: Existing industry C: High Seas D: None of above

中国大学MOOC: China is flanked by the Bohai sea, the Yellow sea, the ____ and South China Seas with the Pacific to the east.

167. On the high seas, a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a ______

Ships passing on the high seas exchange salutes by lowering and raising their flags once. A: information B: ceremonies C: greetings D: privileges

Rivers, lakes and seas may be polluted by all of the following except ________. A: oxygen B: acid rain C: fertilizers D: waste material