题干
This is Jim Green. Jim is his name.
A：one
B：first
C：the first
D：the one
答案(点此获取答案解析）
B
This is Jim Green. Jim is his name.
A：one
B：first
C：the first
D：the one
是半圆
的直径,点
在半圆上,
于点
,且
,设
,则
＝( )