细胞的蛋白质合成过程中，核蛋白体沿mRNA移动时，供能的物质是（）
A.cAMP
B.ADP
C.ATP
D.CTP
E.GTP
参考答案：E
2cos30°=______．
-- ________Alan’s pens?
--Yes, they’re ________.
A．Is this; his
B．Are these; his
C．Is this; her
D．Are these; her
