A researcher has found that the number of work hours needed to type in 5 words i

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问题 A researcher has found that the number of work hours needed to type in 5 words is directly proportional to the square root of s. If 2 work hours are needed to type in 2000 words, how many hours are needed to type in 4000 words?

选项 A、
B、
C、
D、
E、

答案 A

解析第一句话中有比例表达“directly proportional to”。定位成比例的两个数量为the number of work hours needed to type in s words(输入s个单词所需要的工作时间)和the square root of s(

)。设工作时间为t，比例为k，则转化为表达式t=

。因为输入2000个单词需要2小时，所以2=

，解得k=

。则输入4000个单词需要的时间

选择A选项。

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A researcher has found that the number of work hours needed to type in 5 words i

Aresearcherhasfoundthatthenumberofworkhoursneededtotypein5wordsi

Ifn=pqr,wherep,q,andrarethreedifferentprimenumbers,howmanydiffere

f(2x)=2f(x)+1forallrealnumberx.Andf(0.5)=1QuantityA:f(2256)Quanti

78：S={1,3,5,7,…,397,399}SetSconsistsoftheoddnumbersfrom1to399,inc

Pointaandbareonthenumberline,thedistancebetweenaandbis7,ifa=

P1isapolygonwith6sides.P2isapolygonwithtwicethenumberofsidesof

Tomintendedtotypeaseven-digitnumber,butthetwo“3”hemeanttotypedid

Ifpandnareprimenumbers,p-n=4,and1.5＜p/n＜2,whatisthevalueofp?_____

A,B,C,D,Earefiverealnumbers.Ais50％greaterthanB.Bis20％lessthan

Onacertainnumberline,if8isdistanceof18fromn,and17ishedistanceo

Despitethe______changesinthiscountry,manytoughissuesremainunsolved.A、ro

Somepeoplebelievethatinternationalsportcreatesgoodwillbetweenthena

ANewYorkTimes-CBSNewspollfoundthatalmost90percentofAmericansthi

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[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Righ

患者，女，27岁，贵州某县人。因畏寒、低热1月、排米汤样尿3天，于1993年12

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