随着新课程的推广,中考题将越来越多地出现具有开放性、探究性和应用性的新颖题,从而考查同学们动脑、动手、合作及设计图案的能力.例1(黄石)如图1,梯形ABCD中,AB∥CD,对角线AC、BD垂直相交于H,M是AD上的点,MH所在直线交BC于N.在以上条件下,试将下列设定中的两个作为题设,另一个作为结论,组成一个正确的命题, With the promotion of new courses, more and more new questions will be open, inquiring and applied in the exam questions, so as to examine the students’ ability to use their brains, hands-on, cooperation and design patterns. Example 1 (Yellowstone) Fig.1, ABCD in trapezoid, AB∥CD, diagonal AC, BD intersect perpendicularly at H, M is the point on AD, MH is the intersection of BC in N. In the above conditions, try two of the following settings One as a title and the other as a conclusion, forming a correct proposition,