12. Nuclear fusion is the force that powers the Sun, the stars, and hydrogen bombs, merging the nuclei of atoms and not splitting them apart, as in nuclear reactors.
(A) merging the nuclei of atoms and not splitting them apart, as in nuclear reactors
(B) merging the nuclei of atoms instead of splitting them apart, like nuclear reactors
(C) merging the nuclei of atoms rather than splitting them apart, as nuclear reactors do
(D) and merges the nuclei of atoms but does not split them apart, as is done in unclear reactors（E）
(E) and merges the nuclei of atoms, unlike atomic reactors that split them apart
请问E中unlike atomic reactors that split them apart的后面是不是缺了助词之类的啊？因为我之前做了一道题好像就是这样的选项不对，比如下面这道题：
6. Because young children do not organize their attention or perceptions systematically, like adults, they may notice and remember details that their elders ignore.
(A) like adults
(B) unlike an adult
(C) as adults
(D) as adults do（D）
(E) as an adult
这题就不选A而选D，是为什么呢？
这种像谁不像谁，后面有时候加助词有时候又不加的问题，我总是稀里糊涂的，请nn跟我讲讲吧！谢谢
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