问题 探究题

为了研究物质的某种特性,某小组的同学先做如下实验:他们在甲、乙两只完全相同的烧杯中分别放入100克的温水和100克的煤油,实验时,让它们自然冷却,并利用温度计和计时器测量液体的温度随时间的变化情况。记录数据分别如表一、表二所示(设甲、乙两杯液体每分钟放出的热量相等)。

(1)分析比较表一(或表二)中第一行和第三行的数据及相关条件,可得出的初步结论是:______________________________________,放出的热量与降低的温度成正比。

(2)分析比较表一和表二中______________________________________________的数据及相关条件,可得出的初步结论是:质量相等的不同物质,降低相同的温度,放出的热量不相等,水放出的热量比煤油放出的热量多。

(3)小组中甲、乙两位同学进一步综合分析比较了表一和表二的数据及相关条件,甲同学认为:同种物质(水或煤油)降低相同的温度,放出的热量与质量成正比;乙同学认为:质量相等的不同物质,放出的热量与降低温度的比值不相等。

请你判断:甲同学的结论________________,乙同学的结论______________________。(均选填“错误”、“合理但不完整”或“合理且完整”)。

答案

(1)质量相同的同种物质(水或煤油);

(2)第三列(或第四列、或第五列、或第六列);

(3)错误;合理但不完整。

填空题

You might think that hamburgers were invented in the United States, but that is not totally true. These (1) , or patties, actually came from Germany in the middle of the nineteenth century. They were brought to the United States by (2) who came from the city of Hamburg. That is why (3) was "hamburger steak".

However, people in other places (4) that they invented the hamburger. Perhaps we’ll never have a (5) . But there’s no question that the hamburger was a (6) . Why Perhaps because at that time, industry was growing and a kind of (7) food was needed for workers.

The hamburger became even more popular (8) when the first chain of fast food restaurants was started. This chain was called "White Castle". It served tiny hamburgers that were sold for only (9) . Then, in the 1930s there came the (10) where customers were served in their cars by waiters in uniform. And the hamburger was one of the most (11) .

By now, The hamburger was ready to (12) the world. And this happened with McDonald’s, which was actually a (13) at first. But by the early 1950s the hot dog was replaced by the hamburger. McDonald’s and other fast food restaurants (14) around the world throughout the rest of the twentieth century. McDonald’s alone has (15) for everyone person in the world.

The importance of the hamburger to (16) remains significant. About (17) of all sandwiches that are eaten are hamburgers. According to some sources, (18) of current workers in the United States had their first job at McDonald’s. But the face of the hamburger is changing (19) . Nowadays it is possible to buy a chicken burger, a turkey burger, (20) , or veggie burger.

19()

问答题 简答题