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 physical 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 Abigail Adams’ lengthy separation from her family, her difficult travels, and her constant battles with illness is to feel 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 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.
(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) resulted not from lapses of high technology but from
(C) resulted from lapses not of high technology but
(D) resulted from lapses not of high technology but have stemmed from
(E) resulted not from lapses of high technology but have stemmed from
37. Seeming to be the only organization fighting for the rights of poor people in the South, Hosea Hudson, a laborer 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 readily 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 poor ones, authentic art from
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