A landing on Mars is within the of current physical theory.
A. scheme
B. scope
C. scrap
D. scale
网友回答
A. scheme
(答案→)B. scope
C. scrap
D. scale
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.)