题目

低温来临时，越冬作物体内的可溶性糖含量（） A．增加       B．减少      C．保持不变       D．随条件变化 答案：A 解析: 冷、冻害来临时，植物体内的谷aa，可溶性糖，脱落酸等物质增加，提高渗透压，以抵抗低温脱水对细胞造成的伤害Kitty is doing more exercises about the commonly confused words. Help her complete the sentences by choosing the correct words in brackets. I ________ (hear/listen to)a dog barking behind me when I went back home.