问题
选择题
A mysterious illness, referred to as “ a typical phenomena”, has been brought under control, the government said on Wednesday, ______ no cause of it has been made public.
A．though
B．when
C．that
D．because
答案
答案：A
“尽管”没有病例公布
、
于一年前测得此矿物的辐射强度为66单位，而半年前测得此矿物的辐射强度为22单位，且目前此矿物的辐射强度为8单位，则目前此矿物中A、B、C物质的质量之和为（）克。