题目内容：
According to the passage, what did professor Emmons propose to have a gratitude attitude?
参考答案：
答案解析：
单选题：According to the passage, what did professor Emmons propose
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已知一个空问几何体的三视图如图3所示，其中正视图、侧视图都是由半圆和矩形组成，根据图中标出的尺寸，可得这个几何体的表面积
已知一个空问几何体的三视图如图3所示，其中正视图、侧视图都是由半圆和矩形组成，根据图中标出的尺寸，可得这个几何体的表面积是__________．
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