英语·选修6(人教版)
第四单元过关检测卷
a卷 基础知识检测
一、用所给单词的适当形式完成下列句子
1.many lakes and rivers have been ________ by industrial waste.the new law will reduce the ________ of the water.(pollute)
答案:polluted;pollution
2.when did the united nations come into ________ ?meat will not get cheaper under the ________ condition.(exist)
答案:existence;existent/existing
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