明天考了。最后三道JJ求助！

1.   time(days)     deliveries

      1            10

      2            9

      3            5

      4            x

已知每个delivery的平均运送时间为3days，求x

A．7

B、12

C、13

D、16

E、

这题我死活搞不懂，JJMM说算出来是6~ 我算还是29.

2.  count the number of ways for a mice climbing from level 1 to level 5..

Pict belowed

A, 16( maybe)

B. 25(maybe)

C 50

D 3^5

E 4^6

NN帮忙吧~~

3.一个刚出现的SCJJ。

Sound can travel through water for enormous distances,
prevented from dissipating its acoustic energy as a result of
boundaries in the ocean created by water layers of different
temperatures and densities.
A.prevented from dissipating its acoustic energy as a
result of
B.prevented from having its acoustic energy dissipated by
C.its acoustic energy prevented from dissipating by
D.its acoustic energy prevented from being dissipated as
a result of
E preventing its acoustic energy from dissipating by

说是较多人支持C，但我记得GWD上的答案是E。

Pict belowed

A, 16( maybe)

B. 25(maybe)

C 50

D 3^5

E 4^6

NN帮忙吧~~

3.一个刚出现的SCJJ。

Sound can travel through water for enormous distances,
prevented from dissipating its acoustic energy as a result of
boundaries in the ocean created by water layers of different
temperatures and densities.
A.prevented from dissipating its acoustic energy as a
result of
B.prevented from having its acoustic energy dissipated by
C.its acoustic energy prevented from dissipating by
D.its acoustic energy prevented from being dissipated as
a result of
E preventing its acoustic energy from dissipating by

说是较多人支持C，但我记得GWD上的答案是E。

哈哈 我也明天考 第一题我是支持你的

第二题我觉得应该是2*4**6*8

语法的那道我觉得E肯定是不对的 应为 preventing的发出对象不是sound，所以做伴随状语是错的，但是按原文的意思如果是分词结构解释前面句子带来的结果也不对 C比较合理

不要盲目相信GWD 做题还是靠自己的语感重要

 恩 明天一起RP大爆发 呵呵

这样的数学题有个公式LZ可以记一下，就是2^(n-1)，这个有5层，所以答案应是16，LS的错误在于：老鼠从一个格子爬到下面一个格子的时候只有2种选择，不会每个格子都可以。

祝两位明天杀鸡成功！

多谢！ls能不能再解答我一个疑惑。。。

418．each of 90 students are at least paticipate at one activities such as 100-meter run... 20 ppl in XX, 40 ppl in JJ, 80

ppl in GG, if 5 ppl join in all three of them, then how many students join in only two of those activities
A. 25
B, 15
C. 10
D. 5
E &&
答案:55,X+J+G-XJ-XG-JG+XJG=20+40+80-(XJ+XG+JG)+5=90

这种题是不是统一可以用这种公式来算？

在某贴中楼主算出来是30 不知其解 望赐教

第一题我怎么觉得题目有问题，呵呵，帮不上忙啦～

这个公式比较繁琐，我没研究过嘿嘿，我的方法是画图，一画就明白了

一共90个人，那么只参加两种的就应该是20＋40＋80－90－5－5

画了个图给你，不过我不会往上贴，你有MSN没有我传给你？

谢谢MM！！一定不辱使命~~