19．B　推理判断题。从文章第五段He learns to forecast avalanches and to bring them roaring on down the mountainsides to reduce their killing strength可知，雪地管理员的职责应是预测天气和控制雪崩。

　　Ⅲ.One possible version：

　　Good morning, everyone!

　　Gratitude education is the first lesson of the life education and safety education launched by the Ministry of Education. We receive it because we want to build up a harmonious society, in which everyone lives in peace and in harmony with each other.

　　We thank our parents for their love, efforts and expectations in bringing us to the world and helping us grow up healthily. We thank our teachers for giving us knowledge and teaching us how to be men. We thank our friends for giving us help and making our world more beautiful. We are also thankful to our competitors because it is they who make us strong and full of courage to deal with any difficulties so that we can achieve great success.

　　We need to know how to express our gratitude. As students, we should spare no efforts to study as hard as possible and learn all the principles to be useful persons needed by society. We should always have a heart of love and a bright future is waiting for us.

　　Thank you for listening!

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