题目

如图甲所示，为测定物体冲上粗糙斜面能达到的最大位移x与斜面倾角θ的关系，将某一物体每次以不变的初速率v0沿足够长的斜面向上推出，调节斜面与水平方向的夹角θ，实验测得x与斜面倾角θ的关系如图乙所示，g取10m/s2，根据图象可求出（ ） A． 物体的初速率v0=3m/sB． 物体与斜面间的动摩擦因数μ=0.75C． 取不同的倾角θ，物体在斜面上能达到的位移x的最小值xmin=1.44mD． 当某次θ=30°时，物体达到最大位移后将沿斜面下滑11．Most likely，you aren't the family breadwinner．But doing a small job or getting a weekly allowance （零花钱） would put some money in your pocket．For kids and grown-ups alike，money is easy to spend．If you aren't careful，it can be going in no time．　　Being responsible with your money is an important skill to learn-and the sooner you start the better．Whether you are tracking your spending or saving for something special，creating a budget can help you deal with your expenses and plan for the future．All you need are paper and a pencil-and some self-control．　　First，take a look at our sample monthly budget．Then，use a separate sheet of paper to plan your own．In the first two columns （栏），list your sources （来源） of income and how much you expect to earn from them．In the third and fourth columns，list what you expect to spend your money on and the amount．　　The left-hand total should be more than or equal to the right-hand total．If it is，you have an effective budget．Budgets are not complex，but sticking to them can be tough．When planning your budget，be realistic about your expenses．If you know that you drop  18 at a movie，don't write  12 in that space simply because you wish you were spending less．　　If you are eyeing a big purchase，such as a  150 skateboard，spend less and save more until you have the total amount．No matter how attractive it may be，avoid spending your savings．One day，you will thank yourself!Monthly IncomeAmountMonthly ExpenseAmountAllowance20.00Snacks 20.00Money earned selling drinks 25.00Music downloads 12.00Money earned babysitting 12.50Movies 18.00Money earned delivering newspapers 30.00Video rental 10.00Total 87.50Total 66.0056．Who is the passage written for？AA．Children．B．Parents．C．Breadwinners．D．Bank managers．57．The purpose of making a budget is to help peopleC．A．learn to be realistic            B．increase their savingC．manage their money well            D．test their power-control58．What should people do when planning a budget？AA．Fill in the expenses as they really areB．Avoid spending money on expensive things．C．Set aside a fixed amount of money as savings．D．List income and expenses on two pieces of paper．59．Which of the following budgets is effective？DA．Monthly IncomeAmountMonthly ExpenseAmountAllowance 20.00Money earned walking dogs 20.00Bus fares  40.00Movies 28.00Total 60.00Total 48.00B．Monthly IncomeAmountMonthly ExpenseAmountAllowance 20.00Movies 30.00Money earned washing cars 10.00Bus fares 10.00Total 30.00Total 40.00C．Monthly IncomeAmountMonthly ExpenseAmountAllowance 27.50Money earned brushing shoes 22.00Money earned washing dishes 22.50Birthday gifts 28.00Total 50.00Total 50.00D．Monthly IncomeAmountMonthly ExpenseAmountAllowance 26.00Video rental 22.00Money earned doing yard work 24.00Birthday gifts 28.00Total 50.00Total 50.0060．The passage mainly tells usB．A．the importance of making a budget        B．how to make a budgetC．how to form good habits               D．how to spend money．