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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
这题再回头过去看了一遍发现感觉又有了新的认识，不仅可以从语意来解题，还可以从语法来解
choice a,b: 主语是increase；choice d,e: 主语是usage。结合语意应该是increase造成负面影响，而不是usage造成负面影响
choice c, if条件状语从句，意思是“如果这些化肥使用增加，它们可以造成严重的环境后果。”不应该是假设状语从句，并且if和whereas同时作为状语修饰主句 they can create serious environmental problems，两个状语之间应该要有连词。
另外choice d,e还有一个语法错误，while状语从句前面应该要有一个连词。而在choice a,b中就出现了这个连词and
such as & like的区别：such as往往用于举例集合里的元素，I like fruit such as grapes and apples. like用于两个平级的名词，Like my brother, I ride a bicycle to school everyday.
while本来就可以当连词，不需要用while的时候还加and。这里的while错在：本来句子表达的是递进关系，while表达的是转折。
我明白你的意思，while的确是作连词表示1）转折 2）同时。我们就拿choice d来说: while if substituted for more traditional fertilizers, 这个while从句修饰的主句是在它后面的this substitution may accelerate soil structure deterioration and soil erosion. 但是这个while从句和它身前的the increased usage of these fertilizers can create serious environmental problems such as water pollution是没有关系的，他们不构成复句的关系。所以在这个地方是需要出现连词的
感恩
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