题干

如图表示气候变化对甲、乙生态系统中种群类型数量的影响.据图分析,下列叙述正确的是(  )

①甲生态系统的抵抗力稳定性一定较乙生态系统强

②甲生态系统中生物群落的营养关系一定较乙复杂

③乙生态系统在S点后一定有新的物种产生

④乙生态系统在S点后一定经历次生演替过程.

A:①③

B:①④

C:②③

D:②④

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答案(点此获取答案解析)

B

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阅读下面的文字,完成下列小题。

                                                                                    清晨我漫步在山坡谷地,

                                                                                    晨光宣泄着永恒的秘密,

                                                                                    山涧里流倘出一条小溪,

                                                                                    她在歌、在唤、在吐露心曲


                                                                                    生活并非安逸,

                                                                                    它是思念和希冀。

                                                                                    死亡并非哀歌,

                                                                                    它是失望与憔悴。

                                                                                    智者不在言词,

                                                                                    其秘密在言词背后藏nì。

                                                                                    伟人不在高位,

                                                                                    不屑权位者才配享荣誉。

                                                                                   (纪伯伦《小溪,你说什么》节选)