Unit 3 Countries and Cities

（1）所在的句子結構通常是：“含有形容詞比較級的主句+引導的從句”，如從句省略，要保留同主句相比的部分及其修飾語。
    e.g. my composition is shorter than hers.
i have more english books than french books.
the pen i’m using now is better than the one i used last year.
（2）相比中，出現的程度和數量之差，須置于形容詞比較級的前面。
e.g. i am 2 years older than my younger brother.
    your shoes are 2 sizes bigger than hers.
    this book is more expensive than that one.
6. 形容詞最高級的用法。
用于兩者以上的比較。通常前面加定冠詞，并有一個表示范圍的短語或從句。
e.g. it is the most interesting book i have ever read.
    john is the tallest boy in the class.
    she is the best student in the school.
7. 其他用法。
（1）形容詞的同級比較。
表示兩者一樣時，用as…as，不及……時，用 not so…as, not as…as
e.g. he is as tall as his elder sister.
    i read lesson 2 as many times as lesson 1.
    in winter it is not so cold in nanjing as in beijing.
（2）形容詞比較級的單獨用法。
    are you feeling better now?
    be more careful.
    eat less meat and more vegetable.
    he has less money.
（3）more and more 越來越
    after march, the weather is getting warmer and warmer.
    now our country is getting stronger and stronger.
the garden is becoming more and more beautiful.
（4）the more… the more 越是……就越
the more angry she became, the more they laughed at her.
the harder you work, the better you will do.
 
四. 課堂練習。
（一）單選。
1. canada is very large but russia is           than canada.
    a. large     b. larger     c. largest      d. the largest
2. the aral sea continued to get         .
    a. small     b. smaller    c. smallest    d. the smallest
3. the amazon river goes         the country.
    a. through    b. across    c. under     d. from
4. they agreed to use           water for farming than before.
    a. few      b. less      c. little       d. a little