题目内容：
地壳中含量最多的元素是（ ）。
A．铁 B．氧
C．氢
D．铝
参考答案：
答案解析：
单选题：地壳中含量最多的元素是（ ）。
- 题目分类：小学综合素质
- 题目类型：单选题
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B．氧
C．氢
D．铝
B．氧
C．氢
D．铝
计算：17-23÷(-2)×3.
计算：17-23÷(-2)×3.
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