截至2004年7月前，我国拥有的人类口头和非物质文化遗产代表作有

①元杂剧     ②昆曲     ③京剧     ④古琴

Danny: Good morning, Jenny.

Jenny: Good morning, Danny.

Danny: Oh, Jenny , this is my sister Kate. She is a teacher.

Kate: Nice to meet you ,Jenny.

Jenny: Nice to meet you , too, Are those your students?

Kate: Yes , they are.

Jenny: And , Who is he?

Danny: He's my brother, Jack.

Jenny: Oh, I see. Well, have a good day!

Jenny\Kate: Thanks! You , too . Bye!

如图示为教学投影仪，在这里平面镜的作用是____ ，透镜的作用是____ ，把投影片放在教学用的投影仪上，如果要使屏幕上得到更大的清晰的像，如图所示，应使投影仪____ （填“远离”或“靠近”）屏幕，并把透镜向____ （填“上”或“下”）移动．

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