25 °C C 2 H 4 (g) 的 D c H m Θ = -1410.97kJ/mol ; CO 2 (g) 的 D f H m Θ = -393.51kJ/mol , H 2 O(l) 的 D f H m Θ = -285.85kJ/mol ;则 C 2 H 4 (g) 的 D f H m Θ = kJ/mol
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【单选题】The New England Centenarian Study at Boston University finds that______.
A.
centenarians are more likely to get depressed
B.
most people over 100 have a happy family life
C.
old people are not interested in social activities
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