415.答案是B;考查副詞的辨義。actively 積極地;independently 獨(dú)立地;skillfully 熟練地;voluntarily 自愿地。根據(jù)下文instead of always turning to others for help的暗示,選B。
416.答案是A;句意:我們必須保持室內(nèi)衛(wèi)生,臟東西與疾病是分不開(kāi)的。hand in hand此處意為happening together and closely conncected密切相關(guān)的,同時(shí)發(fā)生的。本句還可以說(shuō)成:Dirt goes hand in hand with disease。