Why does the author mention "cosmic rays"?
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04/09 15:08:26 (Tiếng Anh - Lớp 12) |
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Why does the author mention "cosmic rays"?
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Số lượng đã trả lời:
A. To explain how the universe began. 0 % | 0 phiếu |
B. To explain the abundance of hydrogen in the universe. 0 % | 0 phiếu |
C. As part of a list of things containing helium. 0 % | 0 phiếu |
D. As an example of an unsolved astronomical puzzle. 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
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