1985年美国出版了《人民年鉴手册》,列出世界十大思想家,()被列为十大思想家之首。
A、孔子
B、毛 * *
C、孟子
D、老子
参考答案:A
18. My mother ____ for Beijing in a few days. I wonder when the earliest plane ____ on Monday?
A.leaves; takes off
B.is leaving; takes off
C.is leaving; is taking off
D.leaves; is taking off
简述生物多样性三个层次之间的关系。