题目

完形填空。 What do you do at weekends? Some people like to __1__ at home, but others like to go for a walk __2__ have a picnic. My friend Jack works hard in a factory during the __3__. At weekends he always __4__ the same thing. On Saturday he __5__ his car and on __6__ he takes his family to a nearby village. His uncle and aunt have a farm there. It isn't a __7__ one, but there's always __8__ to do. The children help with the animals and give them their __9__, Jack and his wife help in the fields. At the end of the day, they are all __10__ and Jack's aunt gives them a big meal. 1. A. pla如图所示，绝热隔板K把绝热的气缸分隔成体积相等的两部分，K与气缸壁的接触是光滑的。两部分中分别盛有相同质量、相同温度的同种气体a和b．气体分子之间相互作用力忽略不计．现通过电热丝对气体a加热一段时间后，a、b各自达到新的平衡．则A. a的体积增大了，压强变小了B. a增加的内能大于b增加的内能C. 加热后a的分子热运动比b的分子热运动更激烈D. b的体积减小，压强增大，但温度不变