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形容词和副词的比较等级
1.平级比较：一般结构为as形容词/副词as。Not as/so形容词/副词as；As形容词a/an单数名词as。
【考例1】 翻译：经过多年的建设，这个小镇现在和地震前一样充满了活力。(as...as)
解析：
本题考查as+形容词+as结构。答案为After years of construction, this town is as lively now as it used to be before the earthquake.
【考例2】 Our neighbor has ______ ours.
A. as a big house as
B. as big a house as
C. the same big house as
D. a house the same big as
解析：B。
本题考查as＋形容词＋a/an+单数名词+as结构。
【考例3】 I have seldom seen my mother ______ pleased with my progress as she is now.
A. so
B. very
C. too
D. rather
解析：A。
本题考查not/never/seldom…+ as/so+形容词+as结构。
2. 比较级：比较级通常用形容词/副词的比较级形式+than表示。用于修饰比较级的常见词语有a lot, far, a bit, a little, much, slightly, any, no, some, even, still。此外，比较级前还可加表示数量的词，如a few, a couple, one-fourth, 10 per cent等。注意：very, too, quite, so, fairly一般不修饰比较级。
【考例1】 It may not be a great suggestion. But before ______ is put forward, we’ll make do with it.
A. a good one
B. a better one
C. the best one
D. a best one
解析：B。
“the+比较级+名词”表示两者中比较……的一个；“a+比较级+名词”表示一个更……的人/物。句意：这也许不是一个很好的建议，但在提出一个更好的建议之前，我们会将就的。根据句意可知用比较级。
【考例2】 I think watching TV every evening is a waste of time—there are ______ meaningful things to do.
A. less
B. more
C. the least
D. the most
解析：B。
“more+形容词”构成比较级。
【考例3】 You’d be exposed to a lot ______ pollution if you moved to a town with pure water and air.
A. more
B. most
C. less
D. least
解析：C。
less表示“更少的”。句意：如果你去一个有着碧水蓝天的小镇，那么你所受的污染会少一些。根据句意可知此处选C。
3. 最高级：通常用the+形容词/副词的最高级形式+(among/of/all)…。修饰最高级的常见词语有the very, the+序数词, by far等。
【考例1】 This is by far ______ movie that I have ever seen. \
A. an inspiring
B. a much inspiring
C. the most inspiring
D. the more inspiring
解析：C。
by far可用于修饰形容词或副词的比较级或最高级，再根据定语从句可推断出此处用最高级。
【考例2】 —How was your recent trip to Sichuan?
—I’ve never had ______ one before. (2011四川)
A. a pleasant
B. a more pleasant
C. a most pleasant
D. the most pleasant
解析：B。
“否定词+比较级”表示最高级含义。
倍数表达
1. 倍数+as +形容词/副词的原级＋as…
2. 倍数＋形容词/副词的比较级＋than…
3. 倍数+ the +名词(如size, height, weight, length, width 等)＋of…
4. 倍数+as+ 形容词+ a/an+ 名词 +as…
5. 倍数+as many (或 much )＋名词＋ as…
6. 倍数+ what从句/ that of…
【考例1】 It’s said that the power plant is now ______ large as what it was.
A. twice as
B. as twice
C. twice much
D. much twice
解析：A。
本题考查“倍数+as +形容词/副词的原级＋as…”结构。
【考例2】 This restaurant wasn’t ______ that other restaurant we went to.
A. half as good as
B. as half good as
C. as good as half
D. good as half as
解析：A。
本题考查语序，正确的语序应该是“倍数+as +形容词/副词的原级＋as…”。
【考例3】 My uncle’s house in the downtown area is much smaller than ours，but it is twice ______ expensive.
A．as
B．so
C．too
D．very
解析：A。
本题考查倍数表达法。这里的倍数是twice，由expensive这一原级可知，这里使用了as...as...这一结构，expensive后面省略了as ours。