题目内容
听力原文：A: Many people prefer taking public buses or the subway or even taxis because parking is getting to be a real headache in some parts of the city.
B: That doesn't surprise me.
What conclusion can we draw from this conversation？
查看答案
搜索结果不匹配？点我反馈
更多问题
【B2】
The difference between a liquid and a gas is obvious【B1】______ the conditions of temperature and pressure commonly found at the surface of the Earth. A liquid can be kept in an open container and 【B2】______ it to the level of a free surface. A gas forms no free surface but 【B3】______ to diffuse throughout the space available; it must【B4】______ be kept in a closed container, as【B5】______ a planet's atmosphere. The distinction was a prominent feature of early theories 【B6】______ the phases of matter. In the nineteenth century, for example, one theory maintained that a liquid could be "dissolved" in a vapor without losing its identity, and another theory held that the two phases are 【B7】______ different kinds of molecules (分子). The theories now prevailing 【B8】______ a quite different approach by emphasizing what liquids and gases have in common. They are both forms of matter that have no permanent structure, and they both flow easily. They are fluids.
The 【B9】______ similarity of liquids and gases becomes clearly apparent when the temperature and pressure are raised somewhat.【B10】______ a closed container partially filled with a liquid is heated. The liquid expands, or 【B11】______ , becomes less dense; some of it evaporates.【B12】______ , the vapor above the liquid surface becomes denser as the evaporated molecules are added to it. The combination of temperature and pressure【B13】______ the densities become equal is 【B14】______ the critical point. Above the critical point the liquid and the gas can no longer be 【B15】______ ; there is a single, undifferentiated fluid phase of uniform. density.
【B1】
听力原文：A: Operator, I booked a long-distance collect call for my sister in Switzerland 25 minutes ago, but I haven't got a reply yet.
B: Sorry. I ring it for you right now.
Who will pay for the call？
听力原文：A: Hello. Good morning. I'm calling to check on the status of my computer.
B: Well, the new parts have just been coming in, so it should be ready by Friday.
What are the two speakers talking about？
微信支付 
支付宝支付