题干
_______ is well known _______ Hong Kong returned to China on July 1st, 1997.
A：It, that
B：As, /
C：As, a
D：It, which
答案(点此获取答案解析）
A
A：It, that
B：As, /
C：As, a
D：It, which
，等腰三角形的腰长为
，则该几何体的体积是
