How Cats See The World

What does the world look like through a cat's eyes？ The basic （A） s of kitty eyes is pretty similar to what humans have， but cats vision has adapted to very different （1） p ， so the world they see looks familiar， but isn't quite the same as ours. As predators， they need to be able to sense （B） m well in very low light. To make that work， they have to sacrifice some of the finer detail and color perception that （2） h have.

Artist Nickolay Lamm， who has previously brought us visualizations（可視性圖像）of urban heat islands（熱島）， took a look at the world through kitty eyes for his latest project. Lamm consulted with ophthalmologists（眼科醫(yī)生）at the University of Pennsylvania's veterinary（獸醫(yī)的）school and a few other animal eye （3） s to create these visualizations comparing how cats see with how humans do. Some of the cat-eye facts he took into account. Humans have a 20 degree range of peripheral （C） v on each side. Cats can see 30 degrees on each side. Their visual field overall is just bigger - they see 200 （4） d compared to our 180 degrees.

Cat vision isn't so great at a （5） d . What we can see sharply from 100 feet away， they need to see at 20 feet. From what （D） r can tell， cats can see blue and yellow （6） c ， but not red， orange or brown colors. Cats can see some six to eight times better than us in the dark. Their elliptical pupils （瞳孔） can open very wide in dim light， but contract to a tiny slit to protect the sensitive retina from bright light.

（A， B， C， D FOR CROSS， 1， 2， 3， 4， 5， 6 FOR DOWN. The first letters of the absents were given）

The Government Subsidy Problem

The government pays farmers a specific fee for each row of four trees that they plant. An enterprising， but dishonest farmer found a way of planting five rows of four trees using only ten trees. How did he do it？

（上期答案略）