问题
单项选择题
Chinese authorities said Tuesday trace amounts of atmospheric（）from Japan have been detected in Beijing and many areas other than Heilongjiang in the northeast but stressed(强调)they pose no threat to public health.
A． radial
B．radiate
C．radiator
D．radiation
答案
参考答案：D
解析：A项的意思是辐射状的;放射式的;径向的;星形的。B项的意思是辐射测量器,辐射计。C项的意思是散热器；暖气片。D项的意思是放射物；辐射。只有D项符合题意。