（E） not as happy as are people who live
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
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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
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