A landing on Mars is within the _____ of current physical theory.
A．schemeB．scopeC．scrapD．scale
　B
　scope 范圍，活動范圍，理解犯圍: 1 Many words are outside the scope of this dictionary. (許多單詞是超出了這本詞典的范圍.) 2 Very hard words are not within the scope of a child's understanding。(非常難懂的詞是超出了一個孩子的理解范圍.) 3 Economics is beyond the scope of a child's mind.(經(jīng)濟(jì)學(xué)是孩子理解不了的.)
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