题目

已知算式2.5×10.3－□×2.5可运用乘法分配律进行简便计算，那么“□”中最不合适的数是（ ）。A.0.3 B.6.3 C.4 答案：【答案】C【解析】将选项代入式中，运用乘法分配律，看看哪个不够简便。乘法分配律：（a＋b）×c＝ac＋bc。A．2.5×10.3－0.3×2.5＝（10.3－0.3）×2.5＝10×2.5＝25，简便。B．2.5×10.3－6.3×2.5＝（10.3－6.3）×2.5＝4×2.5＝10，简便。C．2.5×10.3－4×2.5＝（10.3－4）×2.5＝6.3×2.5＝15.75，不简便。故答案为：C 第三节 完形填空(共20小题；每小题1.5分，满分30分) 阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。         When I was about 13, my father would take me on short outings on Saturdays．On the way home, Dad  21 stopped at the Dairy Queen for 10-cent ice creams．I couldn’t  22  it, but I could pray from the  23 we started heading home to that corner where we would either go straight for the ice cream or  24  and go home empty-handed．That corner  25  either mouth-watering excitement or 26 ． One day, we were heading home, and again I was praying for the  27  sound of his offer．It  28 ．“Would you like an ice cream today?” “That sounds great, Dad!” But then he said, “Would you like to  29  today?” “Twenty cents!” I thought to myself, “I can afford it．I got 25 cents’ pocket money and some  30  for odd jobs（零活）．Well,  31  it is enough, ice cream isn’t a good use of it.”    32 , I said, “Well, in that case, I guess I’ll  33 .” My father just said, “Okay, Son.” But as we headed home, I realized how wrong I was and begged him to  34 ．But he just said, “That’s okay, we don’t really need one.” I felt  35  for my selfishness and ungratefulness．He didn’t mind, or  36  act disappointed． From that I  37  generosity（慷慨）goes two ways and gratefulness (感谢) sometimes costs more than “thank you”．On that day gratefulness would have cost 20 cents and it would have been the  38 ice cream I’d ever had． I’ll tell you one more thing．We  39  another trip the next week．As we  40  the corner, I said, “Dad, would you like an ice cream today? My treat.” 21．A．suddenly           B．hardly      C．frequently             D．strangely 22．A．expect     B．mention            C．wait          D．get          23．A．month        B．day           C．weekend          D．time         24．A．finish        B．drive          C．turn D．return        25．A．showed  B．meant        C．suggested         D．instructed     26．A．anger        B．shame     C．happiness        D．disappointment 27．A．interesting         B．surprising          C．beautiful    D．funny    28．A．came        B．spoke       C．rung         D．flew        29．A．serve B．treat        C．buy           D．provide      30．A．extra        B．limited     C．little         D．easy       31．A．since  B．as    C．when    D．although    32．A．However    B．Therefore          C．Besides  D．Instead  33．A．accept        B．pay           C．pass               D．forbid       34．A．turn back          B．carry on           C．stop by            D．give in     35．A．unsatisfied         B．ashamed C．shameful          D．crazy      36．A．even         B．never         C．only         D．somehow   37．A．recognized         B．learned    C．realized  D．found     38．A．dearest      B．worst      C．cheapest          D．best        39．A．made up   B．prepared for    C．went on  D．took on   40．A．came over        B．came left       C．came out              D．came near