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按要求用正确的化学符号表示： (1)2个氮原子_____。(2)铵根离子_____。(3)地壳中含量最多的金属元素。_____ (4)1个硫酸分子____。(5)构成氯化钠晶体的阴离子____。(6)由硫离子与亚铁离子构成的物质___
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A.
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D.
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becoming a professional writer was his goal.
B.
he had something secret in his heart.
C.
learning to write was his childhood dream.
D.
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