Although the national government has introduced some new laws on this subject, i

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问题 Although the national government has introduced some new laws on this subject, it is ______the state governments which are responsible for pollution control.

选项 A、precisely
B、primarily
C、progressively
D、preliminarily

答案 B

解析 副词辨析。precisely意为“正好”;primarily意为“根本上、主要地”;progressively意为“日益增多地”;preliminarily意为“预备地、初步地”。根据上下文语义,只有primarily贴合句意。
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