It is reported that the United States uses    energy as the whole of Europe.

A．as twice

B．twice much

C．twice much as much

D．twice as much

下列有关人体内RNA的错误叙述是（）。

A.rRNA与多种蛋白质共同构成核糖体

B.仅有rRNA、tRNA和mRNA这三种RNA

C.RNA存在局部双链结构

D.rRNA是含量最大的RNA

E.tRNA在蛋白质生物合成中作为氨基酸的载体