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

　　A. food

　　B. light

　　C. oxygen

　　D. comfort

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

　　A. they enjoy travelling with the sheep

　　B. they can eat the parasites on the sheep

　　C. they depend on the sheep for existence

　　D. they find the position most comfortable

　　31. The underlined word “they” in the first paragraph refers to ____.

　　A. birds and sheep

　　B. birds and parasites

　　C. parasites and sheep

　　D. sheep, birds and parasites

　　32. What does the second paragraph mainly discuss?

　　A. Some animals live better together.

　　B. Some plants depend on each other for food.

　　C. Some animals and plants develop their relationship easily.

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

　　D.

　　For years I have had no idea what I have been doing with my life. I was a 30-year-old lawyer(律师) in New York. But being a lawyer was never my dream or goal in life. I honestly wanted to be a writer. I have a great imagination and would write amazing stories in my head. But I always knew that being a writer was never possible for me because it was a better financial decision to stay a lawyer.

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