This museum here for over 80 years. It one of the oldest buildings in this city.
A:is; was
B:had been; is
C:was; has been
D:has been; is
人体是一个统一的整体,各个系统之间密切联系,如图是人体进行消化、呼吸、循环、排泄等部分生理活动的示意图(其中①﹣⑦表示生理过程,A、B、C、D表示人体的系统或器官),请据图回答下列问题
日本福岛核泄漏的成分有碘﹣131和铯﹣137等.碘元素与铯元素的本质区别是( )