1-5:B;C;C;C;D
6-10:B;C;D;C;B
11-15:A;C;B;B;D
16-20:B;D;A;C;C
21-25:A;C;B;D;D
26、three 27、clean
28、pollution 29、expensive
30、also/so/petrol/only/no/slow
31、throat 32、have
33、bad 34、drink 35、doctor 36、popular
37、from 38、well 39、make 40、fruits
41、略