初中化学的很多反应可以表示为：甲+乙→丙+丁，其中甲、乙、丙、丁及可能是单质，也可能是化合物，下列说法中，正确的是（　　）

​

选字填空。

①路     陆

走____    ____地     登____     ____灯

②加     家

回____    ____号     参____      国____

观察下列等式，$1^3+2^3=3^2,1^3+2^3+3^3=6^2,1^3+2^3+3^3+4^3={10}^2$，根据上述规律，$1^3+2^3+3^3+4^3+5^3+6^3=$( 　　)

根据短文内容简要回答下列问题。

    Do you like drinking coke, coffee, juice or milk? Do you often drink them instead of water? However, of all the things we eat and drink, water is the most important. Not all of us understand this but it is quite true. Human body can go without food for a long time, but two or three days without water usually makes people die.

    Many people do not understand how much water the human body needs to work well. What is true is that many people do not drink enough, especially in hot weather. Most people drink only when they are thirsty but often need more water after they take exercise.

    Does anyone know what is the 65%-75% of human body? It is water. If we do not have enough water, we will feel tired and become ill. So, do you know what the best drink is? It's water.