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口语毛病太多,,,,网页
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(十)鸟
, t* g7 n7 a4 ~# r- M/ i1 \As we discussed, human eyes have three types of different color receptors respond to three basic colors black, green, and red. All other color are seem to combination of these different types of receptors. Birds however have receptors for these three basic colors and for ultraviolet or UV light. Those they have much greater color range. What is really interesting though is the role UV light play in bird’s life. Scientists have discovered that the birds eye is extremely sensitive to out trive light. In one experiment robins are able to distinctive between two objects. One completely unlight and one lit by very dean(dim) light. Even with very dean light the object was radially apparent to the robins . IN another experiment, female birds were exposed to two male birds one is behind the filter transparent to UV light. And one is behind the block the UV light, the female prefer the male bird behind the transparent. Those may have peer(appeared) more colorful, hunting birds use UV light to track down small animals. This is possible because small animals use urine to mark the trails and observe the UV lights. The hunting birds can use UV light to follow the trail of their pray.
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(十一)海洋生物
6 ?. l( R J1 k% lOk, class, as I mentioned in the beginning of the semester, we will have a feel trip to local marine (marina) and that trip will be take next week. Before we go, there are a few things I want to point out to you, particularly I want to talk about barnacles. As we discussed, it is a shellfish, usually small, less than lake. it is related to the lobsters, shrimps and crap. However, unlike other shellfish was considered silent organisms. That is they are potentially damaging nuisances. You know, because they attach themselves to wood piers, rocks and ship bottoms, as we will see orienals. And they even attach themselves to other living creatures such as turtles and whales. Now bo use a very powerful cement it is self made to attach themselves. In fact it is one of the most powerful groon(glues) known. Paleontologists even discovered fossils from hundred millions years that have bo still attached. So, as you can see, it is a really powerful and long lasting cement scientists today even try to duplicate their powerful adhesive. Only a few country use for food,
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. However, there is only one type of botany found in US in west coast. That reaches weight to three pounds and actually grows up to five inches tall, it tastes like a lobsters or crab.
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今天加油!!