单选题 What do you know about the sea? Everyone knows that the sea looks beautiful when the sun is shining on it. But it becomes very terrible(可怕的) when there is a strong wind. If you study the map of the world, you'll learn that about three quarters of the world is the sea.
The sea is very deep. In some places, the sea is much deeper. The highest mountain in the world is about 9 kilo-metres high while the deepest(最深的) place of the sea is about 11 kilo-metres deep.
The sea can be very cold. At the top of the sea the water may be warm. But ff you go down, it becomes colder and colder. In most places of the sea, there are lots of fishes and 'plants. Some live near the top of the tea. Others live deep down. But in some places of the sea, no fishes can live at all.
单选题 The sea is not beautiful when ______.
  • A. the sun is shining on it
  • B. it is very windy
  • C. there is no sunshine
【正确答案】 B
【答案解析】[解析] 从第一段But it becomes very terrible when there is a strong wind. 可知，当有强风时，大海变得非常可怕。也就是说当有强风时大海并不美丽，故选B。
单选题 ______ of the world is covered by water.
  • A. All
  • B. Half
  • C. Most
【正确答案】 C
【答案解析】[解析] 从第一段If you study the map...about three quarters of the world is the sea. 可知，地球表面的四分之三都被水覆盖着，也就是大部分被水覆盖着。故选C。
单选题 The highest mountain is nearly ______.
  • A. eleven thousand metres high
  • B. nineteen thousand metres high
  • C. nine thousand metres high
【正确答案】 C
【答案解析】[解析] 从第二段The highest mountain in the world is about 9 kilo-metres high...可知，世界上最高的山大约是9千米高，故选C。
单选题 At the top of the sea the water may he ______ than the water deep down.
  • A. warmer
  • B. cooler
  • C. colder
【正确答案】 A
【答案解析】[解析] 从第三段At the top of the sea the water may be warm. But if you go down, it becomes colder and colder. 可知，海洋表面海水温度高，越往底部，水温越低，海洋表面海水比底部海水温暖，故选A。
单选题 We can't see any ______ in some places of the sea.
  • A. ships
  • B. plants
  • C. fishes
【正确答案】 C
【答案解析】[解析] 从最后一句But in some places of the sea, no fishes can live at all.可知，在海洋中一些地方，鱼类不能生存，故选C。