2009 进军美利坚作文组 8.22 综合写作

penergyUID: 2667830

9.7作业


According to the lecture, the professor holds the opinion that the importing species are benificial ,which differs from the viewpoint in the text that importing species has more of a negative than a positive effect. And the professor provides us three reasons to against the points narrated by the article.
Firstly, the professor holds that importing species are not the main cause to destory native species.She gives us the opposite conclusion to the freshwater species in North America.What makes freshwater species such as frogs、salamanders、mussels and crayfishes extinctive is the pollution and some diseases.
Secondly,contradicting from the text that importing species can upset the ecological balance of a region, the professor agree that importing species can benifit the region under a proper control.And as a consequece, importing species can fertile the agricultural base and improve the environment.
Thirdly, there is also no evidence to show the introduced specise may impose economic burden on the region.The professor cites that the introduced mesquite from Mexico to Africa can make African more wealth.It is not the durden to economy because it is a solution to improve the life in Africa. People there use meiquite for fire wood and agriculture. Thanks for these meiquite, more annimals like immigrated birds shelter it and settle down in the meiquite.
From the reasons mentioned by the professor.It is not convincing that imporing species has more negative than a positive effect to the native species.

penergyUID: 2667830

9.8作业
赶出来的，没检查过！！！


There is a debate about the statement whether daily homework is necessary for students is right or wrong.The old saying says"Practice makes prefect".Accordingly, I do agree with this statement.And there are several reasons as follows.
Frist of all, daily homework is of great importance to both teachers and students.Students must do more exercises to be familiar with their learing which they are taught. In some special fields, it is critical for teachers to assign homework.For instance, students who major in art courses are obliged to have more practice to enhance their basic skills. They must paint and play the instruments everyday in order to keep their level. Otherwise, if there are no assignments, students may be lazy to practise.
Secondly, daily homework can also help teachers know the situation about the students' acdamic performance.It is beneficial to the teacher. From the daily homework, teachers know how to teach student in the next step and also sometimes if the homework is easy,teachers can take more advanced things about the class into consideration.Furthermore, teachers also can learn a lot of knowledge from the homework done by students. It can be the experience to solve the problems appeared in the homework.
Thirdly, daily homework can be the standard. On one hand,students use the homework to understand how they acquire the knowledge and what they should do in the future.On the other hand, teachers can take referance from the homework and know which students are industry.
And more importantly, the superintendent of the education department can use the statistics to know which districts have a high eduction quality. And they can adjust the resource to keep the balance.
Hardly could we deny that daily homework is a neccesity for both students and teachers. It can play an important role in both educational system and students' study.

penergyUID: 2667830

9.9作业


In the lecture, the professor thinks the three theories proposed to explain how birds navigate are not convincing,which differs from the opinion in the text.And the professor gives us three reasons to refute the theories.
First of all, the professor casts doubt on the viewpoint that birds navigate by using the sun or the star.Sun compass are useless sometimes, And he asks a question how the birds navigate at night.To illustrate his idea, he gives an example about a bird. This kind of bird does not use the star to reach home.
Secondly,contradicting from the opinion in the text, the professor holds that the landmarks theory is not valid.Because the landmarks will change a lot in a short time and birds can not recognize them.What's more, the birds' navigation does not depend on observing various landmarks.They have the ability to go home in an unfamiliar environment.
Thirdly, the professor holds an opposite opinion that the earth's magnetic field can not play an important role in the birds' navigation.It can not point out the specific location by using the magnetic sensor.
In a word, as the professor mentioned, these three theories have their own limits and can not be strong supports to explain how birds navigate over thousands of miles to reach home.

fancywwUID: 2583671

In the lecture, the professor thinks the three theories proposed to explain how birds navigate are not convincing,which differs from the opinion in the text.And the professor gives us three reasons to refute the theories.


First of all, the professor casts doubt on the viewpoint that birds navigate by using the sun or the star.Sun compass are useless sometimes, And he asks a question how the birds navigate at night.To illustrate his idea, he gives an example about a bird. This kind of bird does not use the star to reach home. - g+ x7 c' M, l

Secondly,contradicting from the opinion （可以写出来什么opinion）in the text, the professor holds that the landmarks theory is not valid.Because the landmarks will change a lot in a short time and birds can not recognize them （没谈到这点，看过文本确认了，估计是受到别的文章的影响了）.What's more, the birds' navigation does not depend on observing various landmarks.They have the ability to go home in an unfamiliar environment.( N; L3 q4 a3 ^

. ^5 t- N  T. j) [7 f
Thirdly, the professor holds an opposite opinion that the earth's magnetic field can not play an important role in the birds' navigation. It can not point out the specific location by using the magnetic sensor.$ q7 o9 f+ ]# i* D

In a word, as the professor mentioned, these three theories have their own limits and can not be strong supports to explain how birds navigate over thousands of miles to reach home.

有几个句子读起来有点别扭，如thirdly后面那句。
其他都很不错。

ly8768UID: 2452066

32# penergy
In the lecture, the professor thinks(think在这里不合适，就propose three theories) the three theories proposed to explain how birds navigate are not convincing, which differs from the opinion in the text. And the professor gives us three reasons to refute the theories.

First of all, the professor casts doubt on the viewpoint that birds navigate by using the sun or the star. Sun compass are useless sometimes, And he asks a question how the birds navigate at night. To illustrate his idea, he gives an example about a bird. This kind of bird does not use the star to reach home.

Secondly, contradicting from the opinion in the text, the professor holds that the landmarks theory is not valid. Because the landmarks will change a lot in a short time and birds can not(cannot) recognize them. What's more, the birds' navigation does not depend on observing various landmarks(好像没有这么说啊). They have the ability to go home in an unfamiliar environment.


Thirdly, the professor holds an opposite opinion that the earth's magnetic field can not play an important role in the birds' navigation. It can not(cannot) point out(point out 应该是人发出的动作) the specific location by using the magnetic sensor.

In a word, as the professor mentioned, these three theories have their own limits and can not(cannot) be strong supports to explain how birds navigate over thousands of miles to reach home.

基本要点都说到了，还是很不错的