Unit 10 The world around us

       對新婚夫婦非常喜歡體育運動。
       the magazine is devoted to science.這本雜志專門刊載科技文章。
  8. throw away 白白放過；放棄；丟掉
     this is your last chance; don’t throw it away.這是你最后的機會了，別失去了。
     all his efforts were thrown away.他的一切努力都白廢了。
三、重點句型
    1. we human beings could not survive without all the plants and animals around us.
       沒有周圍的動物和植物，我們人類就無法生存。
       介詞短語without在這里表示假設條件，相當于if there were no plants or animals around us.有時虛擬條件不用從句而用介詞短語來表示。例如：
       without her help, the police couldn’t have succeeded in solving the mystery in such
       a short time.如果沒有她的幫助，警察不可能在這么短的時間內破了這個疑案。
      but for the storm, we could have arrived here earlier.
      要不是那場暴風雨，我們早就到這里了。
       we could have done better under more favorable conditions.
       在更有利的條件下我們還可以做得更好。
    2. if we know more about what causes endangerment, we may be able to take measures
       before it is too late.如果我們能更多地了解致使生物瀕危的原因，就能及時采取補救措施。
       before 趁…..（還沒有）。例如：
       they are thinking of buying the house before the prices go up.
       他們正在考慮趁房價未漲時把房子買下來。
       if you don’t like the present job, i suggest you look for another one before it is
       too late.
       如果你不喜歡目前的工作，我建議你趁早另謀出路。
    3. a species can become endangered for different reasons.物種瀕臨危險有各種原因。
       endanger危害、危及（某人/某事物）；使遭到危險 (cause danger to sb / sth; put sb /sth in danger)。例如：
       the polluted air in the city is badly endangering the health of the people.
       城市中被污染的空氣嚴重地危及人民的健康。
       drunk-driving can not only cause traffic accidents, but also endanger the lives of