( The rising of costs ) of data-processing operations at many financial insititutions has created a growing opportunity for independent companies to provide these services more efficiently and at lower cost.
A. The rising of costs
B. Rising costs
C. The rising cost
D. Because the rising cost
E. Because of rising cost
D E 没有主语,排除。谓语是单数,B 排除。A是成本的上升,C是上升的成本,句意是创造了更多的机会去提供服务。感觉意思都说的过去,纠结好久。答案是C。做题时没有关注到后面的 at lower cost,不知道这里和前面的cost有没有关系,是否可以根据这里把A排除?麻烦老师讲解。
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提问:
GMAT数学(博智教材)第62页:If X is equal to the sum of the even integers from 40 to 60, inclusive, and y is the number of even integers from 40 to 60, inclusive, what is the value of x+y?
X=40+42+44......60=550
Y=(60-40)/2+1=11, 答案应该是561,为什么书后面的答案显示是560?
DS:5个数中 median 小于 average ;另外7个数也median 小于 average,然后这12个数没有重复的,12个数放在一个数集里面,问是不是median 小于average?
条件1:7个的average 小于 5个的average
条件2:7个的median 小于 5个的 median
题目:of the 200 students at college T majoring in one or more of the sciences, 130 are majoring in chemistry and 150 majoring in biology. If at least 30 of the students are not majoring in either chemistry or biology, then the number students majoring in both biology and chemistry could be any number from
a) 20 to 50
b) 40 to 70
c) 50 to 130
d) 110 to 130
e) 110 to 150
问题:这道题能理解到是用集合的知识点,但是无论怎么做都无法突破,得到最后结果。还请老师讲解。谢谢