One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

21.(11分,除标注外,每空1分)(1)不同植物根系细胞膜上吸收离子的载体蛋白的种类和数量存在差异(2分)(2)快光照、氮肥、CO2(答出两点即可,2分)(3)AA>B(4)否右富含有机肥的农田中,微生物将有机肥分解,释放CO2,故c点会右移(2分)【解析】(1)玉米和大豆的根系吸收无机盐离子的差异与其细胞膜上载体蛋白的种类和数量有关(2)根据题图,大豆的光合午体现象明显,与玉米合理间作可缓解这一现象。间作也可提高农作物对光照氮肥和CO2的利用(3)据表分析,A为阳生植物。100mol光子/(m2·s)时,A、B的呼吸速率分别为16、4molO2·m·s,净光合速率相同,故A、B两植物氧气的产生速率为A>B(4)22h植物不进行光合作用,故10h与22h固定的CO2不同。富含有机肥的农田中土壤微生物活动旺盛,产生的CO2多,c点右移

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