将3.42 g蔗糖与3.24 g淀粉混合并使其完全水解,若反应后生成m g葡萄糖和n g果糖,则n:m为 [ ]
A.1:3
B.3:1
C.1:5
D.5:1
答案:A
Tom is a promising student. I am sure that with his________effort, he will make a very successful scientist.
A.usual
B.constant
C.content
D.normal
知识分子在中国革命中常常起着()
A.先锋和桥梁作用
B.率先革命的领导作用
C.摇摆不定、动摇作用
D.忽“左”忽右、破坏作用