In fig 1,ABCD is a quadrilsteral,E is a point the diagonal BD,EF∥AD,EM∥BC,then the value of is (英漢詞典:fig figure的縮寫,圖;quadrilateral四邊形;diagonal對角線;value數(shù)值;variable變量;to depend on取決于;position位置) 四邊形ABCD中,E是對角線BD上一點,EF∥AD,EM∥BC,則的值為
A.
greater than 1(大于1)
B.
equal to 1(等于1)
C.
less than 1(小于1)
D.
variable depending on the position of E(不能確定,與E的位置有關)