step:看单词(看来只有不断的重复了,加油不要停,再看几遍我一定能记得住多一些,再多些)
7 N: a2 g2 V8 cstep:总结185篇的3篇(教育问题类结束

,还有7类就结束了,我要加快步伐喽)
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step:听写&跟读模仿+笔记(笔记上还是有很多的问题,抓不住要点

,做题也只对一半)进度,听写结束了生物类,明天进入地球科学类
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7 |( x- Z7 }, P外面在下雨,心里很平静,对这就是我要的状态
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第十五类(寄生菌)
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, u6 ^ k. g* R8 YThe professor will be discussing a solution to a health problem caused by a certain parasite that sometime infects human
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1 G) |8 P1 n8 k: {- LA PAPASITE is the org
anism that live in or on another organism called the HOST. During the talk, listen for:
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- Where the parasite normally lives.
- How the parasites infects and harms humans.
- How the proposed solution is supposes to work.
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Let's look another way the health
agency to fight in parasite's d
iseases. One
alternative to drug
s and
pesticides is
to use biological ag
ency. In other words, if the parasite
cause problems, you find something
that eats parasite
itself or something
that eat parasite normal host th
en you turn somrthing lose in the parasite habitat. For example, consider the
Schistosomiasis(血吸虫病), schistosomiasis is the infection with parasite w
orm called Schistosome. Normally the host for these
schistosome worm is the kind of
fresh water (淡水)
snail(蜗牛). But in the African country
Ke
nya(肯尼亚) worms f
requently infect humans
who expose to (使受)water from
ponds(池塘) where the snails live. this contact commonly occurs when people give their c
attle water or wash their clothes in ponds. infected
by 2 millions Kenya most children are infected. When inside to human host, the
worm lays eggs and these can result in the internal bl
eeding, fev
er,
fatigue (疲劳)and sometime death. There are still necessary of host so, because schistosome eggs can only hatch inside snail. If you already infected, you can take the drug to kill the worm but the drug is expe
nsive and it's easy to get
re-infected. when you g back to the ponds.
Instead the researchers try to
eliminate worm
normal host, the snail, by introduc
ing Louisiana crayfishes into the ponds where the worms and snails lives. Now as you
can see a crayfish looks something like
miniature (缩小的模型)lobsters and it loves to eat snail. snail shell are rich in
calcium which crayfishes eat for its own shell. And crayfish already abundant in nature Kenya river they were imp
orted in very early 1970 and they are easy to find. So carysish could end up being chief perfect ways to reduce receive schistosomiasis. If they do though it would be the first time a biological a
gent has been successfull used to control a parasite.
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错误依然很多

:L
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本帖最后由 lora 于 2008-6-15 11:14 编辑 ]