如图所示，下列推理及所注理由正确的是（　　）

碳元素与氧元素的本质区别是

    Jenny is Mr. White's little daughter. She is good at Art . But she isn't good at Math. Mr. White is teaching her ,”What's six plus three?”

    Jenny counts her fingers and answers ,”It's nine .”

    “Good .What's twenty minus three?”

    Anna counts her fingers and toes. “Mm.it's five .No , it's seventeen .”Jenny answers slowly.

    “What's eleven plus twelve, then ?”Jenny looks at her fingers and toes . They are not enough (足够). Seeing this , Mr. White isn't glad and says, “Use your head, Jenny .”

    “That's not enough .I've got only one head.”

根据短文内容，判断下列句子是否正确。

根据拼音在下面语段的横线上写出相应的汉字。
在几千年的历史长河中，中华民族虽经历cāng sāng_______，饱受磨难，但每一次都能以我们民族特有的百折不náo_____的精神和坚rèn____不拔的毅力，化险为yí_____，转危为安。我们坚信，有各族人民并肩xié______手，同舟同济，众志成城，就一定能战胜一切困难！