问题
选择题
, I think, and the problem could be settled.
A．If you don’t doubt your efforts
B．So long as you keep up your spirits
C．Making great efforts
D．A bit more efforts
答案
答案：D
考查祈使句。A bit more efforts 这里是祈使句，“只要再多一点努力”and这里是并列连词，用来连接另一句句子the problem could be settled soon，选D。
现用光子能量为E的γ射线照射静止氘核使之分解，反应的方程为
。若分解后中子、质子的动能可视为相等，则中子的动能是[ ]
