①输入 , 输出它的相反数             

       ②求面积为 的正方形的周长

       ③在三个不等实数 中，求最大数

       ④求函数 的函数值

其中不需要用条件语句来描述其算法的有             （    ）

    Wouldn't it be funny if your mum said to you, "It's time for bed, honey. It's almost November!" Well, if you were a baby bear, your mother might let you know it's time to go into a deep sleep around October.

    That "deep sleep" is called "hibernation (冬眠)". When it gets cold, bears have to go into hibernation. By taking this long sleep, they can get through the cold months when the food, like berries (浆果) and nuts, cannot be found easily.

    Have you ever heard someone say that they are as hungry as a bear? Bears need to eat a lot of food before hibernating. They eat so much that they may put on forty pounds of fat in a week. During the winter "bears will live off the fat stored in their bodies. Bears are able to do that because their bodies use a lot less energy during hibernation. Their heartbeats slow down, their breathing slows down, and their body temperature drops.

    If you were going to sleep all winter, wouldn't you want to be in a safe and protected place? That is what a bear wants, so it looks for a cave to sleep in. It makes a bed using grass, leaves and twigs (嫩枝). The bear usually starts to hibernate as early as October and doesn't wake up until April or May. By the time the bear wakes up, it will have lost much of the fat. But spring time will bring much food to enjoy until it is time to hibernate again in the autumn.

景德镇原名昌南镇，据史书记载，宋真宗景德年间昌南镇的瓷器作为贡品进贡朝廷，贡品的底部写有“景德年制”的落款。“其器尤光致茂美，当时则效，著行海内。于是天下咸称景德镇瓷器，而昌南之名遂微。”由此可以看出景德镇

读荷兰圩田居民点的设置示意图，回答下列问题。