TOEFL Reading: ETS-TOEFL阅读机经 - N766A5G8HJ15RMJ0L$

What role does paragraph 1 play in the passage A. It introduces a common opinion that the rest of the passage challenges on the basis of scientific evidence. B. It explains why the passage focuses on actions people take individually rather than on actions people take as part of a group. C. It offers a specific example of a general principle discussed in the rest of the passage. D. It describes two phenomena, possible explanations of which are considered in the rest of the passage.