The distribution of mass within the core of the Earth ,like the mantle that surrounds the core,has been deduced from the orbital behavior of the Earth and the motions of satellites controlled by the gravity of the Earth.
A.the mantle that surrounds the core
B.that within the mantle surrounding the core
为什么选B呢？偶看不懂
请NN指教！！
觉得这两个都不对，有没有类似 like that of the mantle surrounding the core的选项。
因为that应该指代distribution。
翻译一下意思：地心内部物质的分布就如同地心周围地幔的分布那样,......
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