题干
I don’t think you should mention it at the beginning of the story, or it may ____ the shocking ending.
A：give out
B：give away
C：give u
D：give off
答案(点此获取答案解析）
B
射线；铯137是铯133的同位素，半衰期约为30年，发生衰变期时会辐射
射线。下列说法正确的是