20. Why do we weigh much on the earth than on Mercury? - Because ________
A. Mercury is nearer to the sun. B. Mercury is much hotter.
C. Mercury has got less gravity than the earth. D. none are correct.
V. Chọn phương ỏn đỳng (ứng với A, B, C, hoặc D) để hoàn thành mỗi cõu sau.
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