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    精英家教网 > 练习册解析答案 > 2025年怎样学好初中英语八年级英语上册沪教版五四制 > 第8页解析答案
    2025年怎样学好初中英语八年级英语上册沪教版五四制

    2025年怎样学好初中英语八年级英语上册沪教版五四制

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    B Answer the questions. 回答问题。
    1. What is the first thing that happens at the sewage treatment plant?
    ________
    2. Why are chemicals added to the water?
    ________
    3. Where does the treated wastewater go?
    ________
    答案：1. The first step is to remove large objects from the water.
    解析：根据第二段“The first step of the sewage treatment process is to remove large objects from the water.”可知，污水处理厂的第一步是从水中去除大的物体。
    2. To kill the harmful bugs you can't see.
    解析：根据第三段“Finally, some chemicals are added to kill the harmful bugs you can't see.”可知，添加化学物质是为了杀死看不见的有害细菌。
    3. It is sent back into the water supply.
    解析：根据第四段“The water is clean now and ready to be released and sent back into the water supply.”可知，处理后的废水被送回供水系统。
    C Put the sentences in the correct order. 将句子按正确的顺序排列。
    A. The water is now clean and ready to go back into the water supply.
    B. Large objects are removed from the water.
    C. Wastewater goes down the drain and reaches a sewage treatment plant.
    D. Air is pumped into the water.
    E. The wastewater is put into large tanks.
    F. Some chemicals are added to the water.
    1. ________ 2. ________ 3. ________ 4. ________ 5. ________ 6. ________
    答案：1. C
    2. B
    3. E
    4. D
    5. F
    6. A
    解析：首先废水从下水道排出到达污水处理厂（C），然后第一步去除大物体（B），接着被送入大水箱（E），之后向水中泵入空气（D），再添加化学物质（F），最后水变干净回到供水系统（A），所以顺序是C→B→E→D→F→A。
    A1 Complete the sentences with when, as, before, after or until. 用when, as, before, after或until完成句子。
    1.
    Until
    the bell rings, students must stay in the classroom.
    2.
    As
    time passed, the city grew more modern and beautiful.
    3.
    After
    years of hard work, his dream of becoming a pilot came true.
    4. My brother was playing games
    when
    someone knocked at the door.
    5. Don't open the door
    until
    the car stops completely.
    6. Tom waited patiently
    until
    the doctor called his name.
    7. In the English class, Mrs White explained the lesson
    as
    she wrote on the blackboard.
    答案：1. Until
    解析：句意为“直到铃声响，学生们必须待在教室里”，until表示“直到……为止”，符合语境。
    2. As
    解析：“As time passed”表示“随着时间的流逝”，as有“随着”的意思，引导时间状语从句，符合句意。
    3. After
    解析：“After years of hard work”表示“经过多年的努力后”，after表示“在……之后”，符合语境“他成为飞行员的梦想实现了”。
    4. when
    解析：句意为“我哥哥正在玩游戏，这时有人敲门”，when表示“这时，当……时”，引导时间状语从句，符合情境。
    5. until
    解析：“Don't open the door until the car stops completely.”表示“直到车完全停下才能开门”，until表示“直到……才”，符合逻辑。
    6. until
    解析：“Tom waited patiently until the doctor called his name.”意为“汤姆耐心等待，直到医生叫他的名字”，until表示“直到……为止”，符合语境。
    7. as
    解析：“Mrs White explained the lesson as she wrote on the blackboard.”表示“怀特夫人一边在黑板上写字，一边解释课文”，as表示“一边……一边……”，强调动作同时进行，符合句意。