What's the best and cheapest light?
f g y e b q d h m a g k l d p o c i n t i h j l
knee ------------ light
（猜一個英文片語）
This is as light as a feather, yet no man can hold it for long. What is it?(six letters)
下面的一段話中隱藏著幾種美國硬幣的英文名稱。你能找到嗎？（答案按照出現順序排列）
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.
What is dark but made by light?
city light有兩個不同的玻璃杯（兩個杯子都接近圓柱體），兩個都裝有一定量的水，A杯的水位比B杯高五厘米。A杯的底部沉沒著一個石塊，當石塊被取出並放入B沉沒后，B杯水位上升了五厘米，並且比這時A杯的水位還高十厘米。則得知A杯與B杯的底面積之比為多少？
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