问题
实验题
某同学做测定玻璃的折射率的实验，操作时将玻璃砖的界线aa′、bb′画好后误用另一块宽度稍窄的玻璃砖，如图甲所示．实验中除仍用原界线外，其余操作都正确，则测得的玻璃的折射率将__________(填“偏大”或“偏小”) 
答案
偏小
分析得折射角增大，故折射率将减小
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某同学做测定玻璃的折射率的实验，操作时将玻璃砖的界线aa′、bb′画好后误用另一块宽度稍窄的玻璃砖，如图甲所示．实验中除仍用原界线外，其余操作都正确，则测得的玻璃的折射率将__________(填“偏大”或“偏小”)
偏小
分析得折射角增大，故折射率将减小
| 完形填空。 | ||||
| It is well known that the English go out with an umbrella or a raincoat. Why? 1 the weather in Britain often changes quickly. It is not very usual for the same kind of weather to 2 long. Spring can be rainy or windy, 3 the weather is getting warmer and you can hope more sunny days. In fact, there 4 as much sunshine in spring as in summer. Summer is 5 time for visitors to go to the seaside and other places of interest. The weather can be sunny and nice. People often go out to have a walk or swim. Fall is a beautiful season 6 trees in the woods and parks changing color. During fall it is still nice to be outside, too. In winter, it gets colder. It might snow, especially on high land and in the north. There are 7 very high winds in this season. January and February are the coldest 8 of the year, while the warmest 9 often July and August. The difference 10 temperature between winter and summer is not so great, winter is about 45℃, and for summer about 15.5 ℃. | ||||
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