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题库 / Prep2007E1-DS-81
In the figure above, what is the ratio ~$\frac{KN}{MN}$~ ?
(1) The perimeter of rectangle KLMN is 30 meters.
(2) The three small rectangles have the same dimensions.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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same dimensions是全等，不是面积。。。
（1）：KLMN的周长是30，不能得出KN和MN的比例关系，所以条件1单独不充分
（2）：a=2b，KN=a, MN=a+b, 知道了a和b的比例关系，所以条件2单独充分
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