根据短文理解, 从A、B、C、D四个选项中选择正确答案填空。

    Mr. Smith 1 from London. Now he is in China. He is 2. He teaches 3 a middle school. He works very hard. His students like 4 very much. He can 5 a little Chinese. His students often teaches him Chinese 6 Sundays. Mr. Smith likes playing football. He often plays football 7 his students.

    Mr. Smith 8 a son. His name is Jack. He is student. He studies in a middle school. He goes to school 9 bike everyday. He gets back home at four in the afternoon. He likes 10 TV in the evening.

实现豌豆人工异花传粉操作步骤的正确顺序是（    ）

①套上纸袋    ②将花粉涂抹在除去雄蕊的雌蕊柱头上

③采集另一植株的成熟花粉     ④除去未成熟花的雄蕊．

苔藓植物有根、茎、叶分化，所以能在多种环境中生活．

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