4.9 JJ

vusprr

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Argu:
“The Saluda ConsolidatedHigh School offers more than 200 different courses from which itsstudents can choose. A much smaller private school down the street offers abasic curriculum of only 80 different courses, but it consistently sends ahigher proportion of its graduating seniors on to college than Consolidateddoes. By eliminating at least half of the courses offered there and focusing ona basic curriculum, we could improve student performance at Consolidated andalso save many tax dollars.”

Math:
1. m is an integer. Determine which is the biggest: m-5, -m*5, -m/5
    I: m < 0
    II: m > -5
2.[No idea how to solve]
  r is the remainder of x^4-y^4 devided by 3. Determine r:
    I: If (x-y) can be divided by 3, r equals 0
    II: If (x+y) can be devided by 3, r equals 2
3. a, b, c are all positive integers. Determine if (a+b)/(b+c) = (a-b)/(b-c)
    I: b = sqrt(a*c)
    II: ax^2+2bx+c = 0 has only one real root

RC:
One about the evolution start of bird's feather. The author questions the commonly accepted thermolation hypothesis and suggests that the feathers have benefit in making a bird look bigger or in mating.
One about a study of ants which refutes the common idea that specialization brings efficiency.
One about a particular fiction by a Parkistan writer. The fiction has not only social economic value but also literature value in its own.

nancy716

thank you for sharing

晓野的野

thx~~~~~~~~

caocaobook

哈哈，谢谢

Waterlady

Many thanks!

珍珠澈爱

同今天考，悲剧了。

真武剑

shuizhishu

thx!!!!!!!!!!!

alinalang

THX~~~~~~~~~~~~~~~~

KRYSTAL22

楼主大发！