小强同学观察到他所拿的AD钙奶塑料瓶示签上标有“240mL 252g”字样．
（1）请你据此算出瓶中所装牛奶的密度．
（2）通常瓶中的牛奶并没有装满．请你想出一种测出该AD钙奶塑料瓶的容积的方法．
（3）小强还观察到：平时喝牛奶的吸管是一端平，一端尖．请你说明一端做得尖有什么好处？
（1）由题意可得，牛奶的质量m为252g，体积v是240cm3，
∴ρ牛奶=
=m v
=1.05g/cm3 252g 240cm3
答：牛奶的密度是1.05g/cm3．
（2）将AD钙奶塑料瓶中装满水，分次倒入量筒中，读出总体积即为其容积．（其它方案合理即可）
（3）削尖的一端是为了减小受力面积，使用时增大对封口的压强，从而轻松将吸管插入瓶中．
| 完形填空：从A、B、C、D四个选项中，选择可以填入空白处的最佳答案。 | ||||
| When you wave to a friend, you are using sign language. When you smile at someone, you mean to be 1 . When you put one finger in front of your 2 , you mean "Be quiet". Yet, people in different countries may use different sign languages. Once an Englishman was in Italy. He could speak 3 Italian. One day while he was walking in the street, he felt 4 and went into a restaurant. When the waiter came, the Englishman 5 his mouth, put his fingers into it and took them out again and moved his lips. In this way, he 6 to say, "Bring me something to eat." But the waiter brought him a lot of things to 7 . First tea, then coffee, then milk, but no food. The Englishman was 8 that he was not able to tell the waiter he was hungry. He was 9 to leave the restaurant when another man came in and put his hands on his stomach. And this sign was 10 enough for the waiter. In a few minutes, the waiter brought him a large plate of bread and meat. At last the Englishman had his meal in the same way. | ||||
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