题目

组成纤维素、纤维素酶和控制纤维素酶合成的DNA的基本组成单位依次是（）      A．葡萄糖、葡萄糖和氨基酸    B．  葡萄糖、氨基酸和核苷酸      C．氨基酸、氨基酸和核苷酸    D． 淀粉、蛋白质和DNA 答案：BThings are ____________ on the moon _________ on the earth. [　　] A．as heavy; as B．not so light; as C．heavier; than D．much lighter; than