求解答？？？？？急！！

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og 12th里面 综合版 语法 练习 28题 a选项 based on cultivation such crops like corn and beans, the harvesting of fish and shellfish, and exploiting... ssuch like 错了我懂 ，应该是suchas 。。但是解释里面说 the second item in the series violates the parallelism required for the series 是什么意思？平行结构里面哪里错了？