问题
选择题
--I did very badly in the exam this time, so I’m very upset.
---Cheer up! I did____than you, but I remain happy.
A．no better
B．better
C．no worse
D．not worse
答案
答案：A
考查情景交际。“我这次考试考得很差，我很烦恼。”“振作起来！我考得并不比你好，但我仍然很开心。”no better than“不比......好；和......一样”；no worse than“不比......差”。故选A。
)衰变为铅核(
)的过程中，要经过8次α衰变和6次β衰变