Which of the following was NOT mentioned in the passage as a source of information

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 questions.

A. printed matter

B. talks with experts

C. a research expedition

D. letters from scientists

* Đáp án

* Hướng dẫn giải

Đáp án : C

A được đề cập: Carson consulted no less than 1,000 printed sources….

B được đề cập: …. frequent discussions with experts in the field.

D được đề cập: … voluminous correspondence …

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