7.B【解析】ATP中的A指腺苷,具有核糖,酶的化学本质为蛋白质或RNA,具有催化功能的RNA中含有核糖,A项正确;酶本身在化学反应前后不发生改变,可以被循环使用,B项错误;酶具有高效性,因此ATP与ADP能快速转化,C项正确;ATP的合成需要酶的催化,酶的合成需要ATP,D项正确。

写作Dear OliverKnowing that you are returning to your homeland, I am reluctant to saygoodbye to you.【高分句型一】(表达对Over的不舍之情)As for the gift, after careful consideration I recommend you the Chineseknot. Made of red threads, it always represents happiness, luck andunity, though in different shapes. It is a tradition for Chinese to hang it inhouses as a decoration,【高分句型二】 It is usually given as a precious gift toclose friends. I think it can convey your best wishes to your friend.(BF-种礼物并说明原因)Hope my advice can be of some help.(希里)Yours, Li Hua

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