Which sentence best describes the main idea of the article? Which of the statements is TRUE?

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问题 Which sentence best describes the main idea of the article?
Which of the statements is TRUE?

选项 A、Plants that are grown without soil do not need food.
B、The roots as well as the leaves of all plants must be able to breathe.
C、When plants are grown close together there is less of a chance for disease.
D、Soil is a much cleaner planting medium than hydroponic gardening.

答案B

解析
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