1/5单选题
难度：
1.如图，AD∥BE∥CF，直线l1、l2与这三条平行线分别交于点A、B、C和点D、E、F，若AB=2，AC=6，DE=1.5，则DF的长为（ ）
| A | 7.5 |
| B | 6 |
| C | 4.5 |
| D | 3 |
- 提示1：
- 5qC55o2u5bmz6KGM57q/5YiG57q/5q615oiQ5q+U5L6L77yM55SxQUTiiKVCReKIpUNG5b6X5YiwPGltZyB3aWR0aD0zOCBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zNy9GRC9yQkFDRkZXYmxFVEJpTVVCQUFBQnh3SXhsbW8yNjkucG5nIj4=
- 提示2：
- 54S25ZCO5qC55o2u5q+U5L6L5oCn6LSo5rGCREbvvI4=
正确答案：Qw==
6Kej77ya4oi1QUTiiKVCReKIpUNG77yMPGJyPuKItDxpbWcgd2lkdGg9MTE2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM3L0ZEL3JCQUNGRldibEVXd3VrMktBQUFDMERuMklDczYxNy5wbmciPjxicj7iiLRERj00LjXvvI48YnI+5pWF6YCJQ++8jg==
2/5单选题
难度：
2.如图，小正方形的边长均为1，则下列图中的三角形（阴影部分）与△ABC相似的是（ ）
| A |  |
| B |  |
| C |  |
| D |  |
- 提示1：
- 5qC55o2u572R5qC85Lit55qE5pWw5o2u5rGC5Ye6QULvvIxBQ++8jEJD55qE6ZW/77yM5rGC5Ye65LiJ6L655LmL5q+U77yM5Yip55So5LiJ6L655a+55bqU5oiQ5q+U5L6L55qE5Lik5LiJ6KeS5b2i55u45Ly85Yik5pat5Y2z5Y+v77yO
正确答案：Qw==
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
3/5单选题
难度：
3.在研究相似问题时，甲、乙同学的观点如下：
对于两人的观点，下列说法正确的是（ ）
对于两人的观点，下列说法正确的是（ ）
| A | 两人都对 |
| B | 两人都不对 |
| C | 甲对，乙不对 |
| D | 甲不对，乙对 |
- 提示1：
- 5Yip55So55u45Ly85aSa6L655b2i55qE5Yik5a6a5pa55rOV5b6X5Ye65Y2z5Y+v
正确答案：QQ==
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
4/5单选题
难度：
4.两个相似三角形对应中线的比2：3，周长的和是20，则两个三角形的周长分别为（ ）
| A | 8和12 |
| B | 9和11 |
| C | 7和13 |
| D | 6和14 |
- 提示1：
- 5qC55o2u55u45Ly85LiJ6KeS5b2i55qE5a+55bqU57q/5q6177yI5a+55bqU5Lit57q/44CB5a+55bqU6KeS5bmz5YiG57q/44CB5a+55bqU6L655LiK55qE6auY77yJ55qE5q+U562J5LqO55u45Ly85q+U5b6X5Yiw5Lik5Liq55u45Ly85LiJ6KeS5b2i55qE5ZGo6ZW/55qE5q+U5Li6Mu+8mjPvvIzorr7ov5nkuKTkuKrkuInop5LlvaLnmoTlkajplb/liIbliKvkuLoyeO+8jDN477yM5YiZMngrM3g9MjDvvIznhLblkI7op6PmlrnnqIvmsYLlh7p45ZCO6K6h566XMnjlkowzeOWNs+WPr++8jg==
正确答案：QQ==
6Kej77ya4oi15Lik5Liq55u45Ly85LiJ6KeS5b2i5a+55bqU5Lit57q/55qE5q+UMu+8mjPvvIw8YnI+4oi05Lik5Liq55u45Ly85LiJ6KeS5b2i55qE5ZGo6ZW/55qE5q+U5Li6Mu+8mjPvvIw8YnI+6K6+6L+Z5Lik5Liq5LiJ6KeS5b2i55qE5ZGo6ZW/5YiG5Yir5Li6MnjvvIwzeO+8jDxicj7liJkyeCszeD0yMO+8jOino+W+l3g9NO+8jDxicj7iiLQyeD0477yMM3g9MTLvvIw8YnI+5Y2z5Lik5Liq5LiJ6KeS5b2i55qE5ZGo6ZW/5YiG5YirOOWSjDEy77yOPGJyPuaVhemAiUHvvI4=
5/5单选题
难度：
5.如图，在正方形网格上，与△ABC相似的三角形是（ ）
| A | △AFD |
| B | △AED |
| C | △FED |
| D | 无法确定 |
- 提示1：
- 55u05o6l5Yip55So5LiJ6KeS5b2i5LiJ6L656ZW/5bqm77yM5b6X5Ye65YW25q+U5YC877yM6L+b6ICM5rGC5Ye655u45Ly85LiJ6KeS5b2i77yO
正确答案：QQ==
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