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
D: if you precede a clause with an initial modifier that doesn't have a subject, then the noun IMMEDIATELY FOLLOWING THE COMMA is automatically assigned as the subject of that modifier.
in this choice, you're saying, weirdly enough, that 'this substitution' is 'substituted' for more traditional fertilizers.
把握核心词,C中they 指代the use of sythetic fertilizers, 但原句想要表达的不是化肥的使用会 造成不好的影响,而是加速使用(an increase)会带来问题!
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