they do better together.
Sometimes an 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 "dustman", 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 light so that they cannot live normally, the corals will die.
1. Some birds like to sit on a sheep beause______.
A. they can eat its parsites
B. they depend on the sheep for existence
C. they enjoy travelling with the sheep
D. they find the position most comfortble.
2. The underlined word "they" in the last sentence of the first paragraph refers to______.
A.birds and parasites
B.birds and sheep
C.parasites and sheep
D.sheep birds and parasites
3. It can be learnt from the text that the coral depends on the plant for______.
A. comfort
B. light
C.food
D.oxygen
4. What does the second paragraph mainly discuss ?
A. Some animals and plants depend on each other for existence.
B. Some animals and plants develop their relationship easily.
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