北美二战娘子军

zy39063

以下是引用许仙在2008-4-17 12:08:00的发言：

1.  7的8n+3次方除以5余几
   

7的X次方	1	2	3	4	5	6
尾数	7	9	3	1	7	9

上表可以看出7每4次方尾数循环，所以条件1下7^(8n+3)的尾数一定为3，所以除5余3

所以条件1下7^(8n+3)的尾数一定为3，所以除5余3 ，这句话什么意思呀？？？
                

MM先把7从1次方到4次方算一下，你会发现尾数分别是7，9，3，1，再算7的5次方又是7，所以7的N次方尾数是4个一循环的。

再看题目中是（8N+3）次方，8N代表是整数的4个一循环，多一个3说明尾数应该是4个数中的第3个，即3. 尾数为0或5是可以被5整除的，是3的话就余3了

不知道说清楚没？

yxydsy2007

以下是引用祝英台在2008-4-17 4:39:00的发言：

262. Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992. Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.
 

(A) Initiated five centuries after Europeans arrived in the New World on Columbus Day 1992, Project SETI pledged a $100 million investment in the search for extraterrestrial intelligence.

这个A选项，逻辑意思有问题。OG的解释说：Project SETI can not have been initiated five centuries after...1992.这句话怎么理解阿？

这个是说Europeans arrived in the New World 在1992年，PROJECT 是INITIATED主语应该没错

另外，我昨天看到一题N1 OF  N2 后面定语跳跃修饰N1的，等我找找电子版的发上来。

祝英台

9. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on surface of the Sun but have never been sighted on the Sun's poles or equator.

(A) are visible as dark spots on the surface of the Sun but have never been sighted on

C) appear on the surface of the Sun as darkspots although never sighted at

答案是A。

对于C解释说althouth引导的句子没有主语，而且sighted is not a complete Verb.

 Certain pesticides can become ineffective if used repeatedly in the same place...  这里if used 为什么没有问题。

这两个有什么区别吗？

许仙

以下是引用祝英台在2008-4-17 23:08:00的发言：

9. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on surface of the Sun but have never been sighted on the Sun's poles or equator.

(A) are visible as dark spots on the surface of the Sun but have never been sighted on

C) appear on the surface of the Sun as darkspots although never sighted at

答案是A。

对于C解释说althouth引导的句子没有主语，而且sighted is not a complete Verb.

 Certain pesticides can become ineffective if used repeatedly in the same place...  这里if used 为什么没有问题。

这两个有什么区别吗？

although引导从句的时候，although后面必须主谓齐全，不可以省略，这点我确定。

祝英台

12. After gradual declension down to about 39 hours in 1970, the workweek in the United States has steadily increased to the point that the average worker now puts in an estimated 164 extra hours of paid labor a year.

(D) After gradually declining

(E) Following gradually declining

答案是D。

OG的解释说 after是介词 declining是分词。

可是介词后只能跟n/动名词阿。这个分词是怎么回事呢？

祝英台

以下是引用许仙在2008-4-17 23:24:00的发言：

although引导从句的时候，although后面必须主谓齐全，不可以省略，这点我确定。

although accounting for 5 percent....American citizen consumen 28 percent of its nonrenewable resource....OG上的那个题有印象吗？不是也省略了吗

其实我是在这样理解的，although , if ,though,都是一类词。但是although never sighted at  我觉得是省略了have been而不单单是个谓语动词be，所以说sighted这个词不完整。这样老理解对吗？

祝英台

13. As Hurricane Hugo approached the Atlantic coast, it increased dramatically in strength, becoming the tenth most intense hurricane to hit the United States mainland in the twentieth century and most intense since Camille in 1969.

(A) most intense since Camille in 1969

(B) most intense after Camille in 1969

(C) the most intense since Camille in 1969

(D) the most intense after 1969, which had Camille

答案D。MM们能说说since 1969和 after1969的区别吗，为什么用since 1969更好呢？

yxydsy2007

The global-warming effect of ocean white caps are one of the many aspects of the ocean
environment that are not yet incorporated in any detail into the computer models used for predicting
how rising greenhouse gas concentrations could affect climate.

(A) The global-warming effect of ocean white caps are one of the many aspects of the ocean
environment that are not yet incorporated in any detail into the computer models used for predicting

(B) The effect on global warming of ocean white caps are one of the many aspects of the ocean
environment not yet incorporated in any detail into computer models, which they use to predict

(C) The effect of ocean white caps on global warming is one of the many aspects
  of the ocean environment
  that are not yet incorporated in any detail into the computer models used to predict

(D) That ocean white caps have an effect on global warming is one of the many aspects of the
ocean environment not yet having been incorporated in any detail into the computer models that are used for predicting

(E) That ocean white caps have an effect on global warming is one of the many aspects of the
ocean environment not yet being incorporated in any detail into computer models, which they use to

这个N1 OF  N2 THAT...,THAT修饰N1

[此贴子已经被作者于2008-4-18 0:17:36编辑过]

yxydsy2007

以下是引用祝英台在2008-4-17 23:55:00的发言：

although accounting for 5 percent....American citizen consumen 28 percent of its nonrenewable resource....OG上的那个题有印象吗？不是也省略了吗

其实我是在这样理解的，although , if ,though,都是一类词。但是although never sighted at  我觉得是省略了have been而不单单是个谓语动词be，所以说sighted这个词不完整。这样老理解对吗？

我也见过，ALTHOUGH后面不一定主谓都要全的，有例句，想不起来在哪了。这道可能还是时态的问题

祝英台

14. The commission has directed advertisers to restrict the use of the word "natural" to foods that do not contain color or flavor additives, chemical preserva­tives, or nothing that has been synthesized.

       (B) or that has been

         (D) or anything that has been

答案是D，但是OG对于B的解释说：that has been distorts the meaning by referring to foods, rather than to something added to a food.

不明白这句话怎么理解？

that在这里是代词指代foods ，也应该用those啊？还是引导定语从句，指代谁啊？