老prep-124题,求各位大神解惑!
Whereas the use of synthetic fertilizers has greatly expandedagricultural productivity in many parts of the world, anincrease in their use can create serious environmental problems such as water pollution, andtheir substitution for more traditional fertilizers may accelerate soilstructure deterioration andsoil erosion.
(A) an increase in their use can createserious environmental problems such as water pollution, and their substitution for more traditionalfertilizers (B) an increase in their use can createserious environmental problems like water pollution, and if substituted for more traditionalfertilizers, it (C) if these fertilizers are usedincreasingly, they can create serious environmental problems such as water pollution, and if used assubstitutions for more traditional fertilizers, they (D) the increased usage of these fertilizers can create serious environmentalproblems such as water pollution, while if substituted formore traditional fertilizers, this substitution (E) the increased usage of thesefertilizers can create serious environmental problems like water pollution, while their substitution formore traditional fertilizers
正确答案是A,我选了D。问题是:A、B选项中的their难道没有指代模糊的问题吗?
|