有人问居里夫人：“您认为成才的窍门在哪里？”居里夫人肯定地说：“恒心和自信心，尤其是自信心。”可见（    ）

    There are many different kinds of parrots in the world. They can not only(不但)live in the tree, but they can also(而且)live on the mountain. Some parrots are quite big. Some are very small. Many people like them, because they often have beautiful colours, and because they can “talk”.

    Do you know why parrots can talk? But most birds cannot. Perhaps, parrots can “talk” because they have big, thick tongues. But some other birds that cannot talk have big, thick tongues, too. So we don't know why parrots can talk.

属于物理变化的是（　　）

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落—____    生—____    遥—____