题目内容：

How is a smartphone different from a cell phone，and what makes it so smart? To understand this，we should start with a history lesson． 1. Cell phones were used for making calls while PDAs could store information and a to-do list，and could be linked to your computer．Then PDAs added cell phones’features，while cell phones added PDA-like(and even computer-like)features．The result was that the smartphone came into being．

Here are some features of smartphones．

Operating system． 2. In general，a smartphone will be based on an operating system that allows it to run applications．For example，Apple’s iPhone runs the iOS，and BlackBerry smartphones run the BlackBerry OS．

Mobile Internet． 3. For this we should say thanks to the growth of 4G data networks，as well as the addition of Wi-Fi．

4. A smartphone may allow you to download apps，edit photos，and get driving directions with GPS．The applications may also allow you to create and edit Microsoft Office documents—or at least view the files．

QWERTY Keyboard．A smartphone includes a QWERTY keyboard．This means that the keys are laid out in the same manner they would be on your computer keyboard，where you don’t have to tap the number 1 to enter an A，B or C．

These are just some of the features that make a smartphone smart．5. What makes a smartphone today may change by next week，next month or next year．Well，a smartphone of the future may be in your brain．

A．Apps．

B．Documents．

C．In the beginning，there were cell phones and PDAs．

D．A smartphone is a mobile phone with an operating system．

E．The technology about a smartphone is always changing，though．

F．You can use your smartphone to link to the Internet at a higher speed．

G．Years ago，many people thought it must be a smartphone if it had a touch screen．