及答案解析分享!大家可以通过适当的练习，来了解自己的备考水平，本文
1、 At a repairshop, the total cost of a repair consists of the charge for parts and a chargeof $22.00 per hour for labor. If thetotal cost of a certain repair at the shop was $249.75 and the charge for partswas $150.75, then the labor charge was for how many hours of labor?
(A)4.5
(B) 5
(C) 5.5
(D)6.5
(E) 9
参考答案：A
题目翻译：在一个修理的商店，修理的总共花费包括零件的费用和每小时 22 美元的人工劳务费。如果某个修理的总共花费是 249.75，零件的花费是 150.75，那么有多少小时的人工劳务?
思路点拨：简单的减法和除法;(249.75-150.75)/22=4.5
2、 Which of the following must be equal to(x^6)(x^4) ?
(A)x^10
(B) x^12
(C) x^20
(D)x^24
(E) x^48
参考答案：A
题目翻译：以下哪个选项等于这个式子?
思路点拨：同底数相乘次方相加，难度不大
3、 Machine A,working alone at its constant rate, manufactures 280 bolts per hour, andmachine B, working alone at its constant rate, manufactures 220 bolts perhour. How many hours will it take formachines A and B, working together at their respective constant rates, tomanufacture 1,000 bolts?
(A) 1
(B) 1.3
(C) 1.5
(D)1.8
(E) 2
参考答案：B
题目翻译：机器 A，在一个恒定的速率单独工作，每小时能生产 280 bolts，机器 B，能生产 220 bolts。如果机器 A，B 一起以各自的速度工作，生产 1，000 bolts 需要多久?
思路点拨：简单的相加。A+B= 500 bolts/hr，1000/500 = 2 hr。读懂题没有难度。
4、 The cost topark a car in a certain parking garage is $8.00 for up to 2 hours of parkingand $1.75 for each hour in excess of 2 hours. What is the average (arithmetic mean) cost per hour to park a car in theparking garage for 9 hours?
(A)$1.09
(B) $1.67
(C) $2.25
(D)$2.37
(E) $2.50
参考答案：C
思路点拔：先计算出 9 个小时的停车费，再除以 9 得每个小时的停车费;9 个小时的停车费为 8+(9-2)*1.75=20.25，每小时：20.25/9=2.25
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