阅读理解

　　Dear iPhone 4 Users,

　　The iPhone 4 has been the most successful product in Apple’s history．It is the best smartphone ever, and most users have told that they love it．So we were surprised when reading reports of reception(信号接收)problems, and we immediately began researching them．

　　To start with, holding tightly(紧紧地)almost any mobile phone in certain ways will reduce its reception by 1 or more bars of signal strength．This is true of iPhone 4, iPhone 3GS, as well as many other phones．But some users have reported that iPhone 4 can drop 4 or 5 bars when tightly held in a way．This is a far bigger drop than normal, and as a result some have said the iPhone 4 has a faulty antenna(天线)design．

　　Upon research, we find that the formula(公式)we use to calculate how many bars of signal strength to display is totally wrong．Our formula usually mistakenly displays 2 more bars than it should for a given signal strength．The big drop in bars is because the high bars were never real in the beginning．

　　We will give a free software update to correct the formula．This software update(软件升级)will also be available for iPhone 3GS．If you are not fully satisfied, you can return your undamaged iPhone to any Apple Retail Store or the online Apple Store within 30 days of buying and get all your money back．

　　Thank you for your patience and support．

Apple

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阅读理解

　　A weather map is an important tool for geographers．A succession of three or four maps presents a continuous picture of weather changes．Weather forecasters are able to determine the speed of air masses and fronts．They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving．Thus, a most significant function of the map is to reveal an synoptic picture(气象图)of conditions in the atmosphere at a given time．

　　All students of geography should to interpret a weather map accurately．Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area．They reveal in a few minutes what otherwise would take hours to describe．The United States Weather Bureau issues information about approaching storms, floods, frosts, droughts and all climate conditions in general．Twice a month it issues a 30-day “outlook” which is a rough guide to weather conditions likely to occur over broad areas of the United States．These outlooks are based on an analysis of the upper air levels．

　　With the use of electronic instruments and satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations(气象站)．Experiments are also in progress for weather modification studies, although few successful results such as artificial rainmaking have been achieved so far．

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