题目

 Some language experts think we learn languages in the same way ________ we learn other things，and ________ we are born with is a general ability to learn and adapt．       A．不填；that what    B．which；what                C．that；what that      D．in which；that 答案：B以下能决定种群基因频率改变方向的是（ ）A．自然选择 B．生存斗争 C．过度繁殖 D．遗传和变异