漫画《无题》告诉我们（  ）

①依法履行义务是享受权利的前提                ②公民在行使权利时要尊重他人权利
③广场舞噪音扰民属于刑事违法行为            ④公民不仅要增强权利观念，而且要增强义务观念 

    There are lots of animals on the earth. What is the biggest animal of all? The whale (鲸) is. A blue whale weighs more than a hundred tons(吨). Whales live in the sea, but they are not fish. They are mammals(哺乳动物) and must have air to breathe(呼吸). The babies drink milk from the mother's body. Every spring, groups of whales swim hundreds of kilometers to warm places.

    Each group goes to the same place every year. The mothers take very good care of their babies. Whales are a gentle kind of giant(温顺的庞然大物). They always live together and help each other. They “talk” to each other in the water with high noise that sounds like singing.

    Yet people kill over a hundred whales a day. They kill them to make many things. The whale dies very slowly an in great pain(疼痛). Some ships kill every whale they can find, even mother whales and babies. If things go on like this, there will be no young whales growing up and no mother whales having more young whales (产下幼仔).

下面现象中，属于内能转化为机械能的现象是(    )

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