【冲刺】倒计时29天

189. Proponents of artificial intelligence say they will be able to make computers that can understand English and other human languages, recognize objects, and reason as an expert does-computers that will be used to diagnose equipment breakdowns, deciding whether to authorize a loan, or other purposes such as these.

(A)  as an expert does--computers that will be used to diagnose equipment breakdowns, deciding whether to authorize a loan, or other purposes such as these

(B)  as an expert does, which may be used for purposes such as diagnosing equipment breakdowns or deciding whether to authorize a loan

(C)  like an expert--computers that will be used for such purposes as diagnosing equipment breakdowns or deciding whether to authorize a loan

(D)  like an expert, the use of which would be for purposes like the diagnosis of equipment breakdowns or the decision whether or not a loan should be authorized

(E)   like an expert, to be used to diagnose equipment breakdowns, deciding whether to authorize a loan or not, or the like

A correct sentence must maintain parallel structure. In choice A, the three-part series (to diagnose ..., deciding,... or other purposes ...) lacks parallelism. C, the best choice, replaces A's third element with/or such purposes as; this phrase functions as a stem for the other two elements, which are recast as two parallel phrases--diagnosing ... or deciding .... Thus, choice C not only manages the parallel structure but avoids the less effective other purposes such as these at the end of choice A. Choice E uses faulty parallel structure (to be used..., deciding ..., or the like). In B and D, which and the use of which introduce sentence elements that lack antecedents or reference. In addition, D is wordy