问题
单项选择题
A．Two detectives investigating the case had tested positive for traces of radiation.
B．The ex-wife and the former mother-in-law of the spy were also poisoned.
C．The Russian businessman who met the former spy in London has fallen ill.
D．There is a high degree of probability that it is polonium that killed the spy.
答案
参考答案：D
解析：[听力原文]
What did the German authorities find about the case of the former Russian spy being poisoned