What's the best and cheapest light?
c m h t k a p i d g b g f o i e h y j l q d l n
knee ------------ light
（猜一个英文词组）
What is dark but made by light?
This is as light as a feather, yet no man can hold it for long. What is it?(six letters)
下面的一段话中隐藏着几种美国硬币的英文名称。你能找到吗？（答案按照出现顺序排列）
Elise was worried. Because of the poor lighting in the dim entry of the ballroom, her worst fears were about to happen: nylons torn and broken heels. Her date was about to nick electrical wires that were sticking out from a light fixture, but Elise pulled him away at the last second.
city light有两个不同的玻璃杯（两个杯子都接近圆柱体），两个都装有一定量的水，A杯的水位比B杯高五厘米。A杯的底部沉没着一个石块，当石块被取出并放入B沉没后，B杯水位上升了五厘米，并且比这时A杯的水位还高十厘米。则得知A杯与B杯的底面积之比为多少？
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