[语篇解读] 植物会说话吗？植物如何“交流”？本文中的科学家们正在尝试用enose来测试植物受到伤害时的反应。
5．We learn from the text that plants communicate with each other by________.
A. making some sounds
B. waving their leaves
C. producing some chemicals
D. sending out electronic signals
[解析] 事实细节题。从文章第一段中的“Instead，plants produce volatile compounds，chemicals that...”可知，植物通过它本身所产生的一种化学物质来进行交流，所以答案选C。
[答案] C
