已选分类
管理学
单选题The population of elephant seals, reduced by hunting to perhaps a few dozen animals early in this century, has soared under federal protection during the last few decades. However, because the species repopulated itself through extensive inbreeding, it now exhibits a genetic uniformity that is almost unparalleled in other species of mammals, and thus it is in far greater danger of becoming extinct than are most other species.
Given the information in the passage above, which of the following is most likely the reason that other species of mammals are leas likely than elephant seals to become extinct?
单选题Sue is now 10 years younger than Jane. If in 5 years, Jane will be twice as old as Sue, how old will Sue be in 3 years?
单选题Questionsrefertothefollowinggraph.1977～1978TEXTB()OKINVENTORYFORSCHOOLSXANDYBYYEAROFPURCHASE(asapercentofthe1977～1978inventory)Note：AllbookswerepurchasednewonJuly1ofeachyear.
单选题In a refinery, the capacity of oil tank A is 70 per cent of the capacity of oil tank B. How many more gallons of oil are in tank A than in tank B? (1)Tank A is 90 percent full; tank B is 50 percent full. (2)When full, tank A contains 50,000 gallons of oil. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Committee X and committee Y, which have no common members, will combine to form Committee Z. Does Committee X have more members than Committee Y? (1)The average (arithmetic mean) age of the members of Committee X is 25.7 years and the average age of the members of Committee Y is 29.3 years. (2)The average (arithmetic mean) age of the members of Committee Z will be 26.6 years. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题If x and y are integers and xy=5, then (x+y)2= (A) 13 (B) 16 (C) 25 (D) 26 (E) 36
单选题The pharmaceutical industry argues that because new drugs will not be developed unless heavy development costs can be recouped in later sales, the current 20 years of protection provided by patents should be extended in the case of newly developed drugs. However, in other industries newproduct development continues despite high development costs, a fact that indicates that the extension is unnecessary. Which of the following, if true, most strongly supports the pharmaceutical industry"s argument against the challenge made above?
单选题If the sum of a set of ten different positive prime numbers is an even number, which of the following prime numbers CANNOT be in the set?
单选题How many integers between 100 and 150, inclusive, can be evenly divided by neither 3 nor 5?
单选题Public reports by national commissions, governors" conferences, and leadership groups have stressed the great need for better understanding of international affairs by the citizenry. If the country is to remain a leading nation in an era of international competitiveness, the need is undeniable. If there is such a need for the citizenry to have a better understanding of international affairs, then all of our new teachers must be prepared to teach their subject matter with an international orientation.
If all of the statements in the passage are true, which one of the following must also be true?
单选题Since 1975 there has been in the United States a dramatic decline in the incidence of traditional childhood diseases such as measles. This decline has been accompanied by an increased incidence of Peterson"s disease, a hitherto rare viral infection, among children. Few adults, however, have been affected by the disease.
Which of the following, if true, would best help to explain the increased incidence of Peterson"s disease among children?
单选题Acertainalloycontainsonlylead,copper,andtin.Howmanypoundsoftinarecontainedin56poundsofthealloy?(1)Byweightthealloyisleadandcopper.(2)Byweightthealloycontains6partsleadand5partscopper
单选题In the workplace, influenza is typically spread by infected individuals to others with whom they work in close quarters. A new medication that suppresses the symptoms of influenza therefore will actually increase the number of influenza cases, because this medication will allow people who would otherwise be home in bed to return to work while infected.
Which of the following, if true, most seriously challenges the prediction?
单选题Iftherevenuefromthesaleofappleswasequaltotherevenuefromthesaleofmiscellaneousitems,whatPERCENToftherevenuefromthesaleoffruitandvegetableswasaccountedforbyapples?
单选题Iteachofthefollowingfractionswerewrittenasarepeatingdecimal,whichwouldhavethelongestsequenceofdifferentdigits?
单选题If x is an integer, is(x+p)(x+q)an even integer? (1)q is an even integer. (2)p is an even integer. (A) 条件(1)充分，但条件(2)不充分． (B) 条件(2)充分，但条件(1)不充分． (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． (D) 条件(1)充分，条件(2)也充分． (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
单选题Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann? (A) 5 (B) 6 (C) 7 (D) 14 (E) 21
单选题The nations biggest retailers reported strong sales during the last six months. During this period of strong sales, profits were weaker than usual. This state of affairs is unusual since or ordinary when sales increase, profits also increase. Which of the following, if true during the last six months, most helps to account for the unusual state of affairs described above?
单选题An overly centralized economy, not the changes in the climate, is responsible for the poor agricultural production in Country X since its new government came to power. Neighboring Country Y has experienced the same climatic conditions, but while agricultural production has been falling in Country X, it has been rising in Country Y.
Which of the following, if true, would most weaken the argument above?
单选题Set S consists of n distinct positive integers, none of which is greater than 12. What is the greatest possible value of n if no two integers in S have a common factor greater than 1?