根据短文理解完成下列各题。

    Mrs. Green had a young dog which was very clever. It often helped her buy a newspaper. One winter evening, the dog went out to play. It was snowing heavily. Soon the ground(地面) became white.

     “The dog never loses his way. Where is he now?” Mrs. Green thought. She shouted(喊) his name.

    But still the dog didn't come back. So she telephoned the police and told them a lot about her dog.

    “My dog is very clever. He always goes out and comes back soon. Sometimes he plays with his friend, Mickey. He can buy a newspaper. He almost talks.”

    The policeman was tired and said, “I think you'd better put your telephone down. Maybe he is trying to telephone you now.”

小明同学把两个额定电压相同的小灯泡串联在电路中，如图所示，他发现L₁比L₂亮，于是他认为L₁的额定功率比L₂的大．请你设计一个实验，证明他这种说法是否正确．（设灯丝电阻不变）

对下列现象的描述不合理的是(  )

在使用显微镜观察玻片标本的过程中，必须左眼注视目镜，右眼闭上，才能看清物像。