18．Sunshine isbeneficial（有益）to plants．

分析 陽光有益于植物．

解答 答案：beneficial．
分享句子結(jié)構(gòu)可知，本句考查短語be beneficial to sth對…有好處，相當(dāng)于be of benefit to sth；故答案為beneficial．

點評 翻譯填空題考查的是詞匯的記憶和運用能力，平時要注意積累和運用．

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