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PC机中鼠标器是常用的输入设备之一。下面是有关鼠标器的叙述
Ⅰ．分辨率是鼠标器主要的技术指标之一，用dpi表示
Ⅱ．鼠标器输入到PC机中的信息是它的移动距离
Ⅲ．鼠标以串行方式输入信息，所以鼠标器都采用标准串口COM与PC机相连
Ⅳ．可以用笔输入设备完成鼠标器的基本功能
上述叙述中，哪些是正确的?
A.仅Ⅰ和Ⅱ
B.仅Ⅰ和Ⅳ
C.仅Ⅱ和Ⅲ
D.仅Ⅲ和Ⅳ

A.分辨率是鼠标器主要的技术指标之一，用dpi表示
B.鼠标器输入到PC机中的信息是它的移动距离
C.鼠标以串行方式输入信息，所以鼠标器都采用标准串口COM与PC机相连
D.可以用笔输入设备完成鼠标器的基本功能
E.仅Ⅰ和Ⅱ
B.仅Ⅰ和Ⅳ
C.仅Ⅱ和Ⅲ

【参考答案】

B
解析：PC机中鼠标器是常用的输入设备之一。其中分辨率是鼠标器主要的技术指标之一，用dpi表示：可以用笔输入设......

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打印机是一种文字图形输出设备。下面是有关打印机的叙述Ⅰ．针式打印机因打印分辨率低、噪声大、速度慢，目前在市场上已经被淘汰Ⅱ．激光打印机打印质量高、噪声低、大都用于银行、证券等行业的前台业务处理Ⅲ．喷墨打印机的特点是能输出彩色图像、噪音低、不产生臭氧，但耗材价格较贵Ⅳ．一般来说，激光打印机的打印速度比喷墨打印机快上述叙述中，哪些是正确的?A.仅Ⅰ和ⅡB.仅Ⅰ和ⅢC.仅Ⅲ和ⅣD.仅Ⅰ、Ⅱ和Ⅲ

A.针式打印机因打印分辨率低、噪声大、速度慢，目前在市场上已经被淘汰
B.激光打印机打印质量高、噪声低、大都用于银行、证券等行业的前台业务处理
C.喷墨打印机的特点是能输出彩色图像、噪音低、不产生臭氧，但耗材价格较贵
D.一般来说，激光打印机的打印速度比喷墨打印机快
E.仅Ⅰ和Ⅱ
B.仅Ⅰ和Ⅲ
C.仅Ⅲ和Ⅳ

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In the 18th century, New York was smaller than Philadephia and Boston. Today it is the largest city in AmericA.How to explain the change in its size and importance?To answer this question we must consider certain facts about geography, history and economies. Together these three will explain the huge growth of America's most famous city.The map of the Northeast shows that four of the most heavily-populated areas in this region are around seaports. At these points materials from across the sea enter America, and the products of the land are sent there for export across the seA.Economists know that places where transportation lines meet are good places for making raw materials into completed goods. That is why seaports often have cities nearby. But cities like New York needed more than their geographical location in order to become great industrial centers. Their development did not happen simply by chancE.About 1815,when many Americans from the east coast had already moved to the west, trade routes from the ports to the central regions of the country began to be a serious problem. The slow wagons of that time, drawn by horses or oxen, were too expensive for moving heavy freight very far. Americans had long admired Europe's canals. In New York State a canal seemed the best solution to the transportation problem. From the eastern end of Lake Erie all the way across the state to the Hudson River there is a long trip of low lanD.Here the Erie Canal was constructeD.After working for several years it was completed in 1825.The canal produced an immediate effect. Freight costs were cut to about one-tenth of what they had been. New York City, which had been smaller than Philadelphia and Boston, quickly became the leading city of the coast. In later years, transportation routes on the Great Lakes were joined to mutes on the Mississippi River. Then New York City became the end point of a great inland shipping system that extended from the Atlantic Ocean far up the western branches of the ississippi.The new railroads made canal shipping not important as before, but it tied New York even more closely to the central regions of the country. It was easier for people in the central states to ship their goods to New York for export overseas.Exports from New York were greater than imports. Consequently, shipping companies were eager to fill their ships with passengers on the return trip from EuropE.Passengers could come from Europe very cheaply as a result.Thus New York became the greatest port for receiving people from European countries. Many of them remained in the city. Others stayed in New York for a few weeks, months, or years, and then moved to other parts of the United States. For these great numbers of new Americans, New York had to provide homes, goods, and services. Their labor helped the city become great.Which of the following can be the best title for the passage?A.The Development of Transportation in New York.B.Exports and Imports of New York.C.How New York Became America's Largest City?D.How New York Exchanged with Europe?

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