《蝙蝠和雷达》的教学难点是理解蝙蝠夜间安全飞行的秘密。教学中 ,我是这样处理的 :一、过渡 ,小结三次“试验”的结果。师 :蝙蝠的嘴和耳朵怎么配合起来飞行的呢？请读第６自然段。二、演练 ,理解“蝙蝠”飞行的秘密。１ 以演理解“超声波”。师 :蝙蝠的嘴在哪儿？（“蝙蝠” The teaching difficulty of “Bats and Radars” is the secret to understanding the safe flying of bats at night. Teaching, I dealt with this: First, the transition, the summary of three “test” results. Teacher: How do the bat's mouth and ears fly together? Please read the sixth paragraph. Second, exercise, understand the “bat” flight secret. 1 To solve the “ultrasonic” solution. Teacher: where's the bat's mouth? (“bat”