环境承载力最主要特点是______。
A.区域性B.时间性C.人为性和自然性的结合D.主观性和客观性的结合
参考答案:D
解析: 环境承载力最主要的特点是客观性和主观性的结合。
要在温室内培育又大又甜的哈密瓜,对温室内温度的控制是[ ]
A.白天适当降低温度
B.夜间适当降低温度
C.昼夜温度保持平衡
D.与室外温度保持一致
In the Oral Approach language teaching begins with the spoken language. Material is taught orally before it is presented in the ______ form.