题干

图a和图b是某细胞结构不同放大倍数的模式图,图b中的①一⑧是细胞内的相关结构.下列关于此图的叙述,正确的是(  )

A:图a可能是洋葱的根尖细胞

B:细胞的渗透吸水能力与⑤内溶液浓度有关

C:细胞遗传和代谢的控制中心是③

D:具有膜结构的细胞器有①②④⑥⑧

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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)