Read the text below once and calculate (roughly) the number of mistakes. Click on the option that corresponds to your estimate. Check the solution before going on to the next question.
Cell phone is becoming indispensable for most of us. Now, you can do a lot of things with your mobile phone. One of these things is the geolocalization. This technology of locating is based on the same system that when you are having a call. In each area, there are antenna towers positioned. There is more antenna towers in urban areas than in rural areas. (...) These antenna towers detect a signal sent by your cell phone and determine where is the closest tower. The system which we use to locate you is the triangulation. (...) As a conclusion, cell phone have strongly evolved and most of us think that cell phone is the future. But we have to be careful on them, their sent waves can be very dangerous.
