2. 外语
  3. All【C1】______things must fight to stay alive. They have to feed on something and at the same time avoid being【C2】______Therefore

All【C1】______things must fight to stay alive. They have to feed on something and at the same time avoid being【C2】______Therefore

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问题    All【C1】______things must fight to stay alive. They have to feed on something and at the same time avoid being【C2】______Therefore they have to solve this big problem of staying alive in their own way. The danger of being eaten in the sea is great. Those plants and animals that do survive usually【C3】______very fast and in great numbers.
  【C4】______sea animals have defensive devices which help them to survive. The jelly fish have【C5】______tentacles(触角)which are used for attack and defense. Another method of【C6】______which sea plants and animals use is disguise. They usually have the same【C7】______as their surroundings.
   In order to stay alive, animals need to have good senses. Fishes have sharp eyes. Almost all animals are sensitive to【C8】______Fishes judge movements in the water by【C9】______of their lines. Fishes and other sea animals can hear well and many of them can【C10】______different types of warning sound.
【C4】
选项 A、Any
B、Every
C、Certain
D、Each
答案C
解析 本题考查语法。由谓语动词形式可知主语为复数，certain指“某些”，修饰animals。
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