题目内容：

China is a large country of agriculture（农业）.We all know that there are more than 800 million 44  in China. China starts to  45  the science of agriculture much earlier than other countries in the world. While people in Europe and America were trying to shoot wild animals and birds for food, farmers in China were  46  the science of agriculture. For example, Jia Sixie, who lived in the Northern Wei period（386-534 AD）,was one of the farming pioneers. After he finished his work in government, he 47  home and spent his time on research into agriculture. He 48  information, did experiments and learnt from the experience of farmers. He wrote a book called Qi Min Yao Shu. The book 49  has 110000 words is about both farming and gardening. This book is 50  to be an important summary（概要）of the knowledge of farming.

1.A、workers   B、farmers   C、pioneers   D、scientists

2.A、develop   B、grow   C、choose   D、interest

3.A、trying   B、working   C、studying   D、growing

4.A、left    B、built    C、destroyed    D、returned

5.A、advised   B、improved   C、collected   D、planted

6.A、who   B、whom   C、it   D、which

7.A、made   B、considered   C、kept   D、studied