492.Los Angeles has a higher number of family dwellings per capita than any large city.
　　(A) a higher number of family dwellings per capita than any large city
　　(B) higher numbers of family dwellings per capita than any other large city
　　(C) a higher number of family dwellings per capita than does any other large city
　　(D) higher numbers of family dwellings per capita than do other large cities
　　(E) a high per capita number of family dwellings, more than does any other large city
　　the key:C
　　比较考点：do的用法
　　531.New techniques in thermal-scanning photography, a process that records radiation from surface areas, makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.
　　(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
　　(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before
　　(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river
　　(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before
　　(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river
　　the key:C
　　lemonee:more......than ever before