A-A+
A．Amber mined from the Appalachian Mountains.B
问题详情
A．Amber mined from the Appalachian Mountains.
B．Amber with no imperfections.
C．Amber containing organic material.
D．Amber with no inclusions.
参考答案
正确答案：C
解析：What type of amber is probably the most valuable for genetic research?
