（B）

    One day a poor farmer was taking a bag of rice to town. Suddenly the bag fell from his horse on the road. He didn't know what to do about it because it was too heavy for him to lift (举起) by himself. He only hoped that somebody would soon pass (经过) by and help him.

    Just at this moment a man riding a horse came up to him. But the farmer was very disappointed（失望的） when he saw who he was. It was the great man living nearby. The farmer had hoped to ask another farmer or a poor man like him for help.

    But to his surprise, the great man got off his horse as soon as he came nearer. He said to the farmer, "I see you need help, friend. How good it is that I'm here just at the right time," Then he took one end of the bag, the farmer took the other. They together lifted and put it on the horse.

    "Sir," asked the farmer, "how can I pay you?"

    "It's quite easy," the great man answered with a smile, "Wherever (无论在哪里) you see anyone in trouble, do the same for him."

一节新的干电池的电压为____ 伏，教室里电风扇正常工作时的电压为____ 伏，每个电风扇之间是____ （选填“串联”或“并联”）连接的。通过一个导体的电流为0.3安，它表示的物理意义是____ 。

 今年“六·五”世界环境日中国主题为“向污染宣战”，旨在体现我们党和国家对治理污染紧迫性和艰巨性的清醒认识，彰显以人为本、执政为民的宗旨情怀和强烈的责任担当精神，倡导全社会共同行动，打一场治理污染的攻坚战，努力改善环境质量，保卫我们赖以生存的共同家园。。

材料一：见下图。

材料二：见下图。