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题库 / Prep2007E1-SC-124
Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.
an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers
an increase in their use can create serious environmental problems like water pollution, and if substituted for more traditional fertilizers, it
if these fertilizers are used increasingly, they can create serious environmental problems such as water pollution, and if used as substitutions for more traditional fertilizers, they
the increased usage of these fertilizers can create serious environmental problems such as water pollution, while if substituted for more traditional fertilizers, this substitution
the increased usage of these fertilizers can create serious environmental problems like water pollution, while their substitution for more traditional fertilizers
like不用举例，排除b、e
a选项正确，and表示并列
c选项they指代了fertilizers，是错误的，应该指代fertilizers增长这件事情
d选项if句子还原就是if this substitution is substituted for more traditional fertilizers，太复杂
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