问题 选择题

下列属于最大的生态系统的是(  )

A.海洋生态系统

B.生物圈

C.草原生态系统

D.森林生态系统

答案

生物圈是地球上的所有生物与其生存的环境形成的一个统一整体,包括所有的生态系统,是最大的.

故选:B

问答题

你认为海峡两岸实现统一有哪些有利条件?

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                           

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

多项选择题