题目

一支铅笔与在平面镜中的像互相垂直，则铅笔与镜面间的夹角为（ ） A． 30° B． 45° C． 60° D． 90° 答案：B【详解】 平面镜成像中，物与像关于平面镜对称，沿镜面对折，物与像重合，所以物与镜面的夹角等于像与镜面的夹角，因为物与镜面的夹角与像与镜面的夹角之和等于物与像之间的夹角，而物（铅笔）与像互相垂直，即物与像夹角为 90°，所以铅笔与镜面间的夹角为=45°故选 B。3、High-quality customer service is preached （宣扬） by many, but actually keeping customers happy is easier said than done． Shoppers seldom complain to the manager or owner of a retail store, but instead will warn their friends, relatives, co-workers, strangers-and anyone who will listen．Store managers are often the last to hear complaints．“Storytelling hurts retailers（零售商） and entertains consumers,” said Paula Courtney, President of the Verde group．The store loses the customer, but the shopper must also find a replacement．” The most common complaints include filled parking lots, cluttered（塞满了的）shelves, overloaded racks, out-of-stock items, long check-out lines, and rude sales people． During peak shopping hours, some retailers solved the parking problems by getting moonlighting local police to work as parking attendants to direct customers to empty parking spaces． Retailers can relieve the headaches by redesigning store display, pre-stocking sales items, hiring speedy and experienced cashiers, and having sales representatives on hand to answer questions．Most importantly, salespeople should be skillful and polite with angry customers． “Retailers who’re enthusiastic and friendly are more likely to smooth over issues than those who aren’t so friendly．” said Professor Stephen Hoch．“Maybe something as a greeter at the store entrance would help．” Customers can also improve future shopping experiences by filing complaints to the retailer, instead of complaining to the rest of the world．Retailers are hard-pressed to improve when they have no idea what is wrong． 1．Why are store managers often the last to hear complaints? A．Most customers won’t bother to complain even if they have had unhappy experiences．       B．Customers would rather relate their unhappy experiences to people around them．       C．Few customers believe the service will be improved．       D．Customers have no easy access to store mangers． 2．What does Paula Courtney imply by saying the underlined sentence in paragraph 2?       A．New customers are sure to replace old ones．       B．It is not likely the shopper can find the same products in other stores．       C．Most stores provide the same．       D．Not complaining to the manager causes the shopper some trouble too． 3．What contributes most to smoothing over issues with customers?       A．Manners of the salespeople．       B．Hiring of efficient employees．       C．Huge supply of goods for sale．       D．Design of the store layout． 4．To achieve better shopping experiences, customers are advised to _____．       A．put pressure on stores to improve their service       B．settle their disputes with stores in a skillful and friendly way       C．voice their dissatisfaction to store managers directly       D．shop around and make comparisons between stores