北師大版高中英語選修七unit21humanbiologylesson32word學案(完整版)
【正文】 kers all over the world are able to work together without pause to help put SARS 15. _________ us. （三） 分層提高 How do you understand the words or phrases in bold letters? Please paraphrase the sentences. 1. Up to one half of the population was lost to the Black Death. up to : lose sth to sth/sb: ________________________________________
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