一、单项选择题 (每小题 2分 ,共 2 0分 )1.图 1中采用减小受力面积的方法增大压强的事例是 (　　 ) .图 12 .图 2所示的四种现象中 ,由于光的反射形成的是 (　　 ) .图 23.下列自然现象中 ,通过融化形成的是 (　　 ) .(A)春天 ,河里的冰化成的水(B)夏天的清晨 ,花草叶子上附着 First, single-choice questions (2 points for each question, a total of 20 points) 1. Figure 1 uses a method to reduce the stress area to increase the pressure of the case is (). Figure 12 . Figure 4 shows the four phenomena The light reflected by the light is (). Figure 23. The following natural phenomena are formed by melting (). (A) Spring, the ice of the river into the water (B) the early morning of summer, flowers and leaves Attached