如图所示，在试管内装些水，用橡胶塞塞住，用酒精灯对水加热，一段时间后，观察到橡胶塞突然被推出。在此过程中，燃料燃烧放出热量，通过____ 的方式使水的内能增加；试管内的水蒸气对橡胶塞做功，水蒸气的____ 能转化为橡胶塞的机械能。这个实验展示了蒸汽机的基本工作原理。

完型填空

What is the best way to study? This is a very important question. Some Chinese students often1very hard for long hours. It is a2habit, but it is not a better way to study. An efficient(讲效率的) student must3enough sleep, enough food and enough rest. Every week you 4to go out for a walk or visit some friends or some nice places. It's good5your study. When you return to your studies, you'll find yourself6han before and you'll learn more.

Maybe we can7that learning English is8taking Chinese medicine. We don't mean that it's bitter (苦的). We mean that like Chinese medicine, the efficiency of your study9slowly but surely.10slowly but surely every day and effects will come just like Chinese medicine.