Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42 The elements other than hydrogen and helium exist...

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions from 35 to 42  

A. constituents

B. radiation

C. cosmic rays

D. particles 

* Đáp án

* Hướng dẫn giải

Từ “they” ý chỉ _____

Đáp án: C

Giải thích: “cosmic rays are not really a form of radiation; they consist of...” chọn C

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