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挺有用的，谢谢~
我也来补充一个例题
Prep2012-Pack1-SC-064 VSC002625 hard
Although beavers can still be found throughout the western United States, their number has declined compared with the eighteenth century, when the abundance of beavers lured armies of European trappers into the Rocky Mountain region to slaughter them for their pelts.
A. their number has declined compared with
B. their numbers have compared with
C. their numbers have declined since
D. their numbers have in comparison to those of
E. the number of them declined since
Logical predication; Verb form
The point of the sentence is to compare the current beaver population in the western United States with the much more abundant beaver populations in the area in the eighteenth century. This comparison is presented as a decline that began when European trappers entered the region and has continued to the present. Some versions of the sentence illogically compare beavers or the beaver populations to the eighteenth century.
A. This sentence erroneously compares the number of beavers with the eighteenth century. The singular number is non-idiomatic and does not capture the reality that at different points between the eighteenth century and now, different numbers have described the beaver population in western U.S.
B. This sentence also compares the numbers of beavers with the eighteenth century.
C. Correct. By using the temporal connector since, this version of the sentence correctly distinguishes between numbers of beavers and the time when their population's decline began.
D. This version of the sentence nonsensically compares numbers of beavers with numbers of eighteenth century.
E. The past tense is incorrect for describing the decline, which began in the past and continues to the present; present-perfect tense is needed. As in A the singular number is non-idiomatic.
The correct answer is C. |
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发表于 2013-5-21 20:49:05
