题目内容
In fig. 1, let 
be an equilateral triangle, D and E be points on edges AB and AC respectively, F be intersection of segments BE and CD, and 
, then the magnitude relati
on between Ad and CE is （ ）
A. 
B. 
C. 
D. indefinite
（英汉词典：equilateral等边的；intersection交点；magnitude大小，量；indefinite不确定的）
C
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In fig 1，ABCD is a quadrilsteral，E is a point the diagonal BD，EF∥AD，EM∥BC，then the value of | EF |
| DA |
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（英汉词典：fig figure的缩写，图；quadrilateral四边形；diagonal对角线；value数值；variable变量；to depend on取决于；position位置）
四边形ABCD中，E是对角线BD上一点，EF∥AD，EM∥BC，则
| EF |
| DA |
| EM |
| BC |
| 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（不能确定，与E的位置有关） |
nt AB，thrn ∠CDM= .(英语小词典：bisector：平分线；perpendicular：垂线；midpoint：中点)
