薏苡仁的药用部位为
A．干燥成熟果实
B．干燥幼果
C．干燥成熟种仁
D．干燥未成熟果实
E．干燥成熟种子
参考答案：C
In these years, the shortages of water has become a ______ problem.
A．global
B．historical
C．chemical
D．local
义务教育阶段的化学课程以提高学生的科学素养为主旨。( )
