31.It may someday be worthwhile to try to recover uranium from seawater， but at present this process is prohibitively expensive.
（A）It may someday be worthwhile to try to recover uranium from seawater
（B）Someday， it may be worthwhile to try and recover uranium from seawater
（C）Trying to recover uranium out of seawater may someday be worthwhile
（D）To try for the recovery of uranium out of seawater may someday be worthwhile
（E）Recovering uranium from seawater may be worthwhile to try to do someday
32. The underlying physica1 principles that control the midair gyrations of divers and gymnasts are the same as the body orientation controlling astronauts in a weightless environment.
（A）as the body orientation controlling
（B）as the body orientation which controls
（C）as those controlling the body orientation of
（D）ones to control the body orientation of
（E）ones used in controlling the body orientation of
33.The spraying of pesticides can be carefully planned，but accidents， weather conditions that could not be foreseen，and pilot errors often cause much larger deposits of spray than they had anticipated.
（A）weather conditions that could not be foreseen,and pilot errors often cause much larger deposits of spray than they had
（B）weather conditions that cannot be foreseen，and pilot errors often cause much larger deposits of spray than
（C）unforeseeable weather conditions，and pilot errors are the cause of much larger deposits of spray than they had
（D）weather conditions that are not foreseeable，and pilot errors often cause much larger deposits of spray than
（E）unforeseeable weather conditions，and pilot errors often cause much larger deposits of spray than they had
34.To read of Adams' lengthy separation from her family，her difficult travels，and her constant battles with illness is to fell intensely how harsh life was even for the so-called aristocracy of Revolutionary times.
（A）To read of
（B）Reading about
（C）Having read about
（D）Once one reads of
（E）To have read of
35. A star wil1 compress itself into a white dwarf，a neutron star，or a black hole after it passes through a red giant stage，depending on mass.
（A）A star will compress itself into a white dwarf，a neutron star，or a black hole after it passes through a red giant stage，depending on mass
（B）After passing through a red giant stage，depending on its mass，a star will compress itself into a white dwarf，a neutron star，or a black hole.
（C）After passing through a red giant stage，a star's mass will determine if it compresses itself into a white dwarf，a neutron star，or a black hole
（D）Mass determines whether a star，after passing through the red giant stage， will compress itself into a white dwarf，a neutron star，or a black hole
（E）The mass of a star，after passing through the red giant stage，will determine whether it compresses itself into a white dwarf，a neutron star，or a black hole
36.In the main，incidents of breakdowns in nuclear reactors have not resulted from lapses of high technology but commonplace inadequacies in plumbing and wiring.
（A）not resulted from lapses of high technology but
（B）resu1ted not from 1apsesdhigh technology but from
（C）resu1ted from 1apses not of high technology but have stemmed from
（D）resulted from lapses not of high technology but have stemmed from
（E）resu1ted not from lapses of high technology but have stemmed from
37. Seeming to be the on1y organization fighting for the rights of poor people in the South，Hosea Hudson，a 1aberer in Alabama，joined the Communist party in 1931.
（A）Seeming to be
（B）As
（C）In that they seemed
（D）Since it seemed
（E）Because it seemed to be
38. Although many art patrons can readi1v differentiate a good debenture from an undesirable one，they are much less expert in distinguishing good paintings and poor ones，authentic art and fakes.
（A）much less expert in distinguishing good paintings and poor ones， authentic art and
（B）far less expert in distinguishing good paintings from per ones， authentic art from
（C）much less expert when it comes to distinguishing good paintings and per ones， authentic art from
（D）far less expert in distinguishing good paintings and poor ones， authentic art and
（E）far less the expert when it comes to distinguishing between good painting， poor ones， authentic art， and
39.Rules banning cancer－causing substances from food apply to new food additives and not to natura1 constituents of food because their use as additives is entirely avoidable.
（A）their use as additives is
（B）as additives，their use is
（C）the use of such additives is
（D）the use of such additives are
（E）the use of them as additives is
40. The average weekly wage near1y doub1ed in the l970' s， rising from ＄ 114 to ＄ 220，yet the average worker ended the decade with a decrease in what their pay may buy.
（A） with a decrease in what their pay may buy
（B） with what was a decrease in what they were able to buy
（C） having decreased that which they could buy
（D） decreasing in purchasing power
（E） with a decrease in purchasing power
41. Since chromosome damage may be caused by viral infections，medical x-rays，and exposure to sunlight，it is important that the chromosomes of a population to be tested for chemically induced damage be compared with those of a control population.
（A）to be tested for chemically induced damage be compared with
（B）being tested for damage induced chemically are compared with
（C）being tested for chemically induced damage should be compared to
（D）being tested for chemically induced damage are to be compared to
（E）that is to be tested for chemically induced damage are to be comparable with
42. The suspect in the burglary was advised of his right to remain silent，told he could not leave，and was interrogated in a detention room.
（A）of his right to remain silent， told he could not leave， and was
（B）of his right to remain silent， told he could not leave， and
（C）his right to remain silent and that he could not leave and
（D）that he had a right to remain silent， could not leave， and was
（E）that he had a right to remain silent， that he could not leave， and was
43. The United States petroleum industry's cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade.
（A） The United States petroleum industry's cost to meet environmental regulations is projected at ten percent of the price per barrel of refined petroleum by the end of the decade
（B） The United States petroleum industry's cost by the end of the decade to meet environmental regu1ations is estimated at ten percent of the price per barrel of refined petroleum
（C）By the end of the decade， the United States petroleum industry's cost of meeting environ mental regulations is projected at ten percent of the price per barrel of refined petroleum
（D） To meet environmental regulations， the cost to the United States petroleum industry is estimated at ten percent of the price per barrel of refined petroleum by the end of the decade.
（E）It is estimated that by the end of the decade the cost to the United 5tates petroleum industry of meeting environmental regulations will be ten percent of the price per barrel of refined petroleum.
44.The relationship between corpulence and disease remain controversial， although statistics clearly associate a reduced life expectancy with chronic obesity.
（A） remain controversial， although statistics clearly associate a reduced life expectancy with
（B） remain controversial， although statistics clearly associates a reduced life expectancy with
（C） remain controversial， although statistics clearly associates reduced life expectancy to
（D） remains controversial， although statistics clearly associate a reduced life expectancy with
（E） remains controversial， although statistics clearly associates reduced life expectancy to
45. If industrial pollution continues to deplete the ozone layer， the resulting increase in ultraviolet radiation wil1 endanger human health， causing a rise in the incidence of skin cancer and eye disease， and perhaps even threatening global ecological systems.
（A） and perhaps even threatening
（B） and may even threaten
（C） and even a possible threat to
（D） as well as possibly threatening
（E） as well as a possible threat to
46. Quasars are so distant that their light has taken billions of years to reach the Earth；consequently，we see them as they were during the formation of the universe.
（A）we see them as they were during
（B）we see them as they had been during
（C）we see them as if during
（D） they appear to us as they did in
（E）they appear to us as though in
47.Unlike that of the Native Americans of British Columbia，the Plains，and the Southwest，those of Puget Sound lived in relatively small， autonomous villages.
（A） Unlike that of
（B） Unlike those of
（C） Unlike
（D） In contrast to that of
（E） Dissimilar to
答案：BCDCD BEADA CCEAA CBADB EBCEA BEDBA C
