45 Over the past 3.5 billion years, roughly how many asteroids may have hit Earth?
(A)14
(B) 85
(C) 113
(D) 11
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統計: A(149), B(32), C(312), D(23), E(0) #1402513
統計: A(149), B(32), C(312), D(23), E(0) #1402513