下列关于细胞化学成分的叙述中，正确的是（）

题干

A：肝脏细胞中含量最多的化合物是糖元

B：RNA分子中也有糖类物质

C：DNA的多样性和特异性取决于核苷酸的种类、数量和排列顺序

D：当生物体内的结合水与自由水的比值升高时，生物体的新陈代谢旺盛

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B

What's your favourite festival? Why do you love it? Let's look at Wendy's favourite festival.

Name	Wendy Roberts	Age	14
School	Woody Middle School
Favourite festival	Thanksgiving Day	Date	The 4th Thursday in November
Reasons: ⒈I have a big family. All my family members go to my grandparents' home this day. We have a good time. Every year we take a lot of family photos. ⒉I can eat my favourite food — turkey (火鸡). The turkey is too big, and we can't eat it up (吃完) at a time. So I can enjoy it in the next two days. ⒊We have a family football game. Boys in my family love it best. We watch or play football together. ⒋Christmas will come in one month after Thanksgiving Day. That is to say, my long winter holiday is coming.