复合生态系统的功能有()。
A.生产
B.生活
C.还原
D.信息传递
参考答案:A, B, C, D
My father ______ my brother for driving but he wanted to pick ______ the knowledge of the computer during his spare time.
A.advised;up
B.persuaded;out
C.intended;up
D.managed;out
人们看书时,用红笔画出重点,便于重新阅读,是利用知觉的哪种特性
A.选择性
B.整体性
C.理解性
D.恒常性