强化
参考答案：形成条件反射的基本条件就是无条件刺激物与中性物刺激在时间上的反复结合，这个过程称为强化。
My brother is tall with curly hair, wearing a pair of glasses. You ______ him very easily .[ ]
A. recognized
B. have recognized
C. will recognize
D. had recognized
关于石竹科识别要点正确的是（）。
A、草本，节部膨大
B、单叶全缘、互生
C、雄蕊为花瓣的3倍
D、特立中央胎座；颖果
