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TPO5的阅读文章Minerals and Plants
最后一题多选,答案○Though beneficial in lower levels, high levels of salts, other minerals, and heavy metals can be harmful to plants.
理由是原文的While mineral deficiencies can limit the growth of plants, an overabundance of certain minerals can be toxic and can also limit growth.
While mineral deficiencies can limit the growth of plants怎么能改写成Though beneficial in lower levels,全文提到mineral deficiencies 都是从负面角度描写,怎么才能从原文中对应答案,请帮忙解答一下