What conditions are needed for shrubs to become established

Câu hỏi :

Read the passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions.

A. More soil must accumulate.

B. The ground must be covered with grass.

C. Smaller plants must die now.    

D. Ferns must take root.

* Đáp án

* Hướng dẫn giải

Đáp án là A.

Dựa vào ý: Roots broke even deeper into the developing soil. These grow rapidly, cutting off sunlight from the smaller plants, and soon establish complete domination - closing their ranks and forming a climax community which may endure for thousands of years

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