A landing on Mars is within the _____ of current physical theory.
A.scheme
B.scope
C.scrap
D.scale
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B解析 scope 范围，活动范围，理解犯围: 1 Many words are outside the scope of this dictionary. (许多单词是超出了这本词典的范围.) 2 Very hard words are not within the scope of a child's understanding。(非常难懂的词是超出了一个孩子的理解范围.) 3 Economics is beyond the scope of a child's mind.(经济学是孩子理解不了的.)