21.【2019 ？湖南省湘西州】—Do you know that China is one of        countries in the world？

　　—Yes，I do. It's much _______ than the US.

　　A. the oldest；older        B. old；older

　　C. older；older

　　22.【2019 ？岳陽(yáng)市】Tina is as ________ as her sister Tara.

　　A. outgoing      B. more outgoing

　　C. the most outgoing

　　23.【2019 ？鎮(zhèn)江市】Because of the flood， there are _________ tourists in that ancient town this year than last year.

　　A. more     B. most     C. fewer     D. fewest

　　24.【2019 ？甘肅省天水市】—What do you think of the environment in your hometown？

　　—It's          Both the air and the water are badly polluted．

　　A．not bad        B．a(chǎn)s good as before

　　C．much better than before   D．not as good as before

　　25.【2019 ？廣西貴港市】—Frank has changed a lot，hasn't he？

　　—Yes．He is much ______________ because he exercises every day．

　　A．strong         B．stronger

　　C．strongest      D．the strongest

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