仙人掌的叶变成了刺是受哪种非生物因素的影响（ ）
A．温度
B．光照
C．水分
D．土壤
环境中影响生物生活的各种因素叫环境因素，分为非生物因素和生物因素．非生物因素包括：光、温度、水、空气、土壤等．生物因素是指环境中影响某种生物个体生活的其他所生物，包括同种和不同种的生物个体．沙漠干旱缺水，仙人掌的叶变成了刺，可以降低蒸腾作用，减少水分的散失，适应干旱缺水的沙漠环境．
故选：C．
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| A: Hello. ____1____ B: I've a bad cough and a headache. I don't feel like eating anything. A: Do you have any fever? B: Yes. I felt very cold this morning, but now I'm feeling a little better. A: ____2____ B: About five days. A: Let me examine you. Any pain here? ____3____ B: Yes,but only a little. A: Let me hear your lungs. Please lie down on the couch and I'll examine your belly. B: ____4____ A: Nothing serious. You just have a flu. Take the medicine three times a day, and get some rest. You should up and around in a couple of days. ____5____ B: Thank you. |