1.John runs ____ than Tom.
A.fast
B.faster
C.fastest
D.more fast
答案：B。“than”表示比较，要用比较级。fast 的比较级是 faster，fastest 是最高级，more fast 这种表达错误。
2.Mary does her homework ____ than Lily.
A.slow
B.slower
C.more slowly
D.most slowly
答案：C。这里要用副词修饰动词“does”，slow 的副词形式是 slowly，比较级是 more slowly，slower 是形容词 slow 的比较级，most slowly 是最高级。
3.Tom gets up ____ than his brother.
A.early
B.earlier
C.earliest
D.more early
答案：B。同样因为有比较，early 的比较级是 earlier，earliest 是最高级，more early 表达错误。
4.Lucy speaks English ____ than her sister.
A.well
B.better
C.best
D.more well
答案：B。well 的比较级是 better，best 是最高级，more well 错误。
5.Jack writes ____ than Mike.
A.quick
lisa多高B.quicker
C.more quickly
D.most quickly
答案：C。quick 的副词形式是 quickly，比较级是 more quickly，quicker 是形容词 quick 的比较级，most quickly 是最高级。
6.Ann finishes her work ____ than Kate.
A.late
B.later
C.latest
D.more late
答案：B。late 的比较级是 later，latest 是最高级，more late 表达错误。
7.Peter studies ____ than Sam.
A.hard
B.harder
C.hardest
D.more hard
答案：B。hard 的比较级是 harder，hardest 是最高级，more hard 错误。
8.Susan dances ____ than Linda.
A.beautiful
B.more beautiful
C.most beautiful
D.more beautifully
答案：D。这里要用副词 beautifully 修饰动词“dances”，比较级是 more beautifully，beautiful 是形容词，most beautiful 是最高级。
9.David swims ____ than Paul.
A.good
B.better
C.best
D.more good
答案：B。good 的副词形式是 well，比较级是 better，best 是最高级，more good 错误。
10.Tina reads books ____ than Rose.
A.quickly
B.more quickly
C.most quickly
D.quicker
答案：B。quickly 的比较级是 more quickly，most quickly 是最高级，quicker 是形容词 quick 的比较级。
11.She runs faster than he _____.
A.do
B.does
C.is
D.are
答案：B。本题考查助动词的用法。前面“She runs”，后面“He”后面用“does”代替“runs”，表示“他跑”。
12.The cheetah runs much faster than the dog _____.
A.do
B.does
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