农业是中国的一个重要产业，从业者超过3亿。中国农业产量全球第一，主要生产水稻、小麦和豆类。 虽然中国的农业用地仅占世界的百分之十，但为世界百分之二十的人口提供了粮食。中国7700年前开始种植水稻。早在使用机械和化肥之前，勤劳和富有创造性 的中国农民就已经采用各种各样的方法来增加农作物产量。中国农业最新的发展是推进有机农业。有机农业可以同时服务于多种目的，包括食品安全、大众健康和可 持续发展。

问答题Directions: For this part, you are allowed 30 minutes to write a short essay on invention. Your essay should include the importance of invention and measures to be taken to encourage invention. You are required to write at least 150 words but no more than 200 words.

单项选择题Consumers are often hesitant to try smart-home devices because they are worried about compatibility problems.