From  56  earlyagehewasinterestedinplants.He  57 (st...

問題詳情：

    From   56   early age he was interested in plants. He   57  (study) agriculture in college and as a young teacher he began experiments in crop breeding. He thought that the key to   58  (feed) people was to have more rice and to produce it more quickly. He thought there was only one way   59   do this-by crossing different species of rice plant, and then he could produce a new plant which could give a   60  (high) yield than either of the original plants.

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