结晶和溶解是两个（）的过程。
A.相同
B.相近
C.相似
D.相反
参考答案：D
“破涕为笑”的现象说明幼儿的情绪和意志受（）影响。
A.记忆
B.知觉
C.注意
D.表象
You can’t imagine what great difficulty I had _______ my father to agree to my plan for the holiday.
A．persuading
B．persuaded
C．to persuade
D．persuade
