题干
Despite the fact that it is still not fully understood, more and more farmers are _________ this modern technology of agriculture．
A：benefiting from
B：convincing of
C：suspecting of
D：protecting from
答案(点此获取答案解析）
A
到
的距离分别是
和
，
与
所成的角分别是
和
，
和
，若
，则（ ）
