问题
选择题
地壳中含量最多的非金属元素是
A．O
B．Si
C．Al
D．Fe
答案
答案：A
地壳中各元素及含量由多到少的顺序是氧、硅、铝、铁、钙、钠、钾、镁、氢；所以含量最多的非金属元素为氧元素．
故选A
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地壳中含量最多的非金属元素是
A．O
B．Si
C．Al
D．Fe
答案：A
地壳中各元素及含量由多到少的顺序是氧、硅、铝、铁、钙、钠、钾、镁、氢；所以含量最多的非金属元素为氧元素．
故选A
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How are things with you? After a summer holiday, it's time to back to school. I'm a middle school now. I'll have new teachers and . I think they are all and friendly. I hope I can more (更多的) friends. We are going to many subjects this year, Chinese, math, English, , art and so on. I Chinese best. I will study on math. I want to do well in my new school. Best wishes. Yours, Lucy |