题目

“You can use me as a last resort（选择）, and if nobody else volunteers，then I will do it.” This was an actual reply from a parent after I put out a request for volunteers for my kids lacrosse（长曲棍球）club. I guess that there's probably some demanding work schedule, or social anxiety around stepping up to help for an unknown sport. She may just need a little persuading. So I try again and tug at the heartstrings. I mention the single parent with four kids running the show and I talk about the dad coaching a team that his kids aren’t even on … At this point the unw28.4×13-325.62÷8.1     312.56-13.49-（16.51-81.44）9.7+3.6÷0.8×1.3-1.3 　45.8×7.36+45.8+1.64×45.810-（0.81+0.9×5.1）÷1.2[9.7+（7.2-5.52）÷1.4]×0.6．