正确答案: A

质子数不同

题目：．碳元素与氧元素的本质区别是

解析：A

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学习资料的答案和解析：

[单选题]下列小实验不能成功的是

用活性炭将硬水软化

[单选题]一个苹果静止在水平桌面上，以下说法正确的是

苹果受到的重力和桌面对苹果的支持力是一对平衡力

[单选题]---- Would you like some more soup?---- _______. It is delicious, but I’ve had enough.

No, thank you

[单选题]CManytextbooksarenotwritteninthekindofEnglishthatwespeakeveryday.Infact,sometimesthereadingisso

comeacross

[单选题]29． There was a hole in _________．

his right pocket

解析：29.C【解析】由短文可知他右边口袋有个洞，故选C．