t0.9指药物含量降低多少时所用的时间( )%
A．90B．10C．75D．25E．37～40
参考答案：B
解析：[知识点] 半衰期
– Simon, don’t give up easily. It’s ______________ to lose the chance.
–Thanks. Your suggestions are ___________.
A．silly of you; valuable
B．silly for you; value
C．silly for you; of value
D．silly of you; value
某丙从小偷处购得项链的行为属于：
