一把钥匙开一把锁。
参考答案：对
解析：这一理论体现在教育上就是因材施教原则。
与蕈样肉芽肿发生无关的因素可能为（）
A.遗传
B.感染
C.日晒
D.化学制剂
E.药物
These fairy tales are as popular as before in that they _____ the common sense of justice and equality.
A．circulate
B．observe
C．satisfy
D．deliver
