已选分类
管理学工商管理
单选题A significant reduction in caloric intake, if accompanied by vitamin supplements, will double the life span of laboratory mice. Mice fed 40 percent of the standard food allowance had twice the life expectancy of mice in a group that was fed the standard allowance.
If the information above is accurate, each of the following statements, if true, would help explain why the laboratory mice on the reduced allowance lived twice as long as the mice fed on the standard allowance EXCEPT:
单选题Ajarcontainsonlyxblackballsandywhiteballs.Oneballisdrawnrandomlyfromthejarandisnotreplaced.Asecondballisthendrawnrandomlyfromthejar.Whatistheprobabilitythatthefirstballdrawnisblackandthesecondballdrawniswhite?
单选题Which of the following best completes the argument below?
One effect of the introduction of the electric refrigerator was a collapse in the market for ice. Formerly householders had bought ice to keep their iceboxes cool and the food stored in the iceboxes fresh. Now the iceboxes cool themselves. Similarly, the introduction of crops genetically engineered to be resistant to pests will______
单选题The presence of microorganisms that produce a toxin causes seawater to turn brownish red, a phenomenon known as a red tide. Sea otters do not feed in areas where clams, their main source of food, have become contaminated with this toxin. According to a proposed explanation of the otters" behavior, the otters sample the clams in a potential feeding area and can taste any toxin in them.
Which of the following, if true, would most strongly indicate that the hypothesis described in the last sentence of the passage is not correct?
单选题A toy store regularly sells all stock at a discount of 20 percent to 40 percent. If an additional 25 percent were deducted from the discount price during a special sale, what would be the lowest possible price of a toy costing $16 before any discount?
单选题Vanda's Butcher Shop sells packages of ground turkey and ground beef. Is the price for a pound of ground turkey less than that for a pound of ground beef? (1)The price for a package of ground turkey is 30 percent greater than the price for a package of ground beef. (2)A package of ground turkey weighs 25 percent more than a package of ground beef.
单选题If k is an integer greater than 44 and less than 51，then which of the following could be the product of 11 and k? (A) 565 (B) 550 (C) 500 (D) 484 (E) 440
单选题F: We ought not to test the safety of new drugs on sentient animals, such as dogs and rabbits. Our benefit means their pain, and they are equal to us in the capacity to feel pain.
G: We must carry out such tests; otherwise, we would irresponsibly sacrifice the human lives that could have been saved by the drugs.
Which of the following, if true, is the best objection that could be made from F"s point of view to counter G"s point?
单选题A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?
单选题Inthefigureabove,whatisthelengthofPQtimesthelengthofRS?(1)ThelengthofPQis5.(2)ThelengthofORtimesthelengthofPRisequalto12.
单选题Accordingtothegraphabove，whenx=3,yismostnearly
单选题If x and y are prime numbers, which of the following CANNOT be the sum of x and y? (A) 5 (B) 9 (C) 13 (D) 16 (E) 23
单选题Xavier,Yvonne,andZeldaeachtryindependentlytosolveaproblem.Iftheirindividualprobabilitiesforsuccessareand,respectively,whatistheprobabilitythatXavierandYvonne,butnotZelda,willsolvetheproblem?
单选题In△ABCabove,ifAB=BC,whatisthevalueofy?(1)x=50(2)z=130
单选题Isthepositiveintegernequaltothesquareofaninteger?(1)Foreveryprimenumberp,ifpisadivisorofn,thensoisp2.(2)isaninteger
单选题How many three-digit numerals begin with a digit that represents a prime number and end with a digit that represents a prime number? (A) 16 (B) 80 (C) 160 (D) 180 (E) 240
单选题Anydecimalthathasonlyafinitenumberofnonzerodigitsisaterminatingdecimal.Forexample,24,0.82,and5.096arethreeterminatingdecimals.Ifrandsarepositiveintegersandtheratioisexpressedasadecimal,isaterminatingdecimal?(1)90＜r＜100(2)s=4
单选题Some governments have tried to make alcohol and tobacco less attractive to consumers by regulating what can be shown in advertisements for these products, rather than by banning advertising of them altogether. However, the need to obey the letter of these restrictions has actually stimulated advertisers to create advertisements that are more inventive and humorous than they were prior to the restrictions" introduction.
which of the following, if true, would, in conjunction with the statements above, best support the conclusion that the government policy described above fails to achieve its objective?
单选题If x, y, and z are positive integers and 3x=4y=7z, then the least possible value of x+y+z is
单选题A certain ball was dropped from a window 8 meters above a sidewalk. On each bounce it rose straight up exactly one-half the distance of the previous fall. After the third bounce the ball was caught when it reached a height of exactly 1 meter above the sidewalk. How many meters did the ball travel in all? (A) 21 (B) 19 (C) 17 (D) 15 (E) 13