The ancient Chinese bird-kites were usually made of light frames covered with ______. The kites used by German U-boats in World

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问题 The ancient Chinese bird-kites were usually made of light frames covered with ______.
The kites used by German U-boats in World War 1I for the military purpose were made of ______.

选项 A、brown paper
B、plastic material
C、light-weight cloth
D、traditional silk

答案C

解析
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