The word "These" in the second paragraph is closest in meaning to_.

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 55 to 64.

A. the various chemical reactions 

B. the compounds moved to the water 

C. the pollutants from the developing Earth 

D. the components in biogeochemical cycles

* Đáp án

* Hướng dẫn giải

Đáp án : D

Ta thấy câu trước là : “As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles” => D

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