在差速离心中最先沉淀的细胞结构是
A． 线粒体
B． 溶酶体
C． 细胞核
D．内质网
参考答案：C
水分平衡
Our class is a happy family. which________16 boys and 19 girls.[ ]
A. consists of
B. is consisted of
C. makes up
D. is made up
