China is a large country of agriculture(农业). We all know that there are more than 800 million  21 China. China starts to  22  the science of agriculture much earlier  23 other countries in the world . 24  people in Europe and America were trying to shoot wild animals and birds for food, farmers in China were 25  the science of agricukture.For example, Jia Sixie, who lived in the Northern Wei period (386-534AD), 26  one of the farming pioneers. After he finished his work in government, he 27  home and spent his time on research into agriculture. He 28  information, did experiments and learnt from the experience of farmers. He wrote a book called Qi Min Yao Shu. The book  29 has 110000 words is about both farming and gardening. This book is 30   to be an important summary( 概要 ) of the knowledge of farming.

21.A.workers          B.farmers       C.pioneers      D.scientists

22.A.develop       B.grow        C.choose      D.interest

23.A.to        B.till         C.then        D.than

24.A.Where       B.For        C.While       D.Because

25.A.trying       B.working      C.studying      D.growing

26.A.were       B.was        C.came       D.be

27.A.left        B.built   C.returned          D.destroyed

28.A.advised      B.improved      C.collected      D.planted

29.A.who           B.whom       C.it         D.which

30.A.made        B.considered     C.kept        D.studied

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