题目

端粒是染色体两端特定序列的DNA-蛋白质复合体，端粒DNA序列在每次细跑分裂后会缩短一截。当短到一定程度时，端粒内侧正常基因的DNA序列会受到损伤，使细胞衰老。下列叙述错误的是（） A . 人体正常细胞的分裂次数是有限的 B . 同一生物体内各种细胞的端粒长度是相同的 C . 端粒DNA序列缩短到一定程度时细胞可能会激活凋亡机制 D . 无限增殖的癌细胞中可能存在延伸端粒DNA序列的机制Hong Kong plays host to exciting events ranging from colourful festivals to world class arts and sports events. When planning your next visit，be sure to include these signature events in your plans.1.Where can sport lovers order tickets for sports events?A．At www．hkticketing．com．B．At www． hksevens．com．C．At Hong Kong Stadium．D．At Auditorium，Kwai Tsing Theatre．2.How much should you pay at least to attend both the jazz concert and Writer’s Block?A．HK $260.B．HK $310.C．HK $440.D．HK $500.3.In which event can audience see Woody Allen in person?A．Affordable Art Fair.B．Jazz Concert— HKCO + Howard MeCrary.C．Writer’s Block.D．Hong Kong Sevens 2014.