题目

据报道，科学家们首次利用仪器“听到”并记录下树木“喝水”时发出的声音．以下关于树木“喝水”的讨论，正确的是（ ） A．树木“喝水”的主要部位一定是根尖的伸长区 B．“喝”进的水一定会沿着根、茎、叶中筛管运送到树木各处 C．“喝水”时，无机盐一定会“搭便车”，“跑”到树木的各个部分 D．听到“喝水”声时，排出叶片气孔的气体必定有水蒸气、二氧化碳和氧气请听下面一段材料，回答第1至第4四个小题。 1. When will the ballet performances be on? [     ]A. This week. B. Next week. C. Next month. 2. When will the man attend the performance? [     ]A. On Sunday evening. B. On Thursday evening. C. On Friday evening. 3. How much does the man pay for the tickets? [     ]A. $20. B. $10. C. $40. 4. Where are they now ? [     ]A. In a book store B. In a clothing store C. In a theatre