Sometimes animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals(珊瑚) of the sea. In their skins they have tiny plants which act as “dustmen”, taking some of the waste products from the coral and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they cannot live normally, the corals will die.

　　63.Some birds like to sit on a sheep because _______.

　　A. they enjoy travelling with the sheep

　　B. they can eat its parasites

　　C. they depend on the sheep for existence

　　D. they find the position most comfortable

　　64.The underlined word “they” in the last sentence of the first paragraph refers to ______.

　　A. birds and parasites

　　B. parasites and sheep

　　C. birds and sheep

　　D. sheep, birds and parasites

　　65.We learn from the text that corals depend on plants for______.

　　A. comfort

　　B. light

　　C. oxygen

　　D. food

　　66. What does the second paragraph mainly discuss?

　　A. Some animals and plants develop their relationship easily.

　　B. Some animals and plants depend on each other for existence.

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