—Jerry, ______ eat in the classroom.
—Sorry, I _______.
A:doesn't, don't
B:don't, don't
C:don't, won't
D:not, not
若图示表明的是物种A与物种B的关系,则物种A与物种B之间的信息传递的方向是( )
已知矩形ABCD中,在BC上取一点E,沿AE将△ABE向上折叠,使B点落在AD上的F点,且四边形EFDC与矩形ABCD相似.
(1)求证:四边形ABEF是正方形;
(2)求证:F点是AD的黄金分割点.