There used to create websites. Hope it helps :)
Non-ionizing radiation is longer wavelength/lower frequency lower energy. While ionizing radiation is short wavelength/high frequency higher energy. Ionizing Radiation has sufficient energy to produce ions in matter at the molecular level.
Internet Explorer is not an Operating System. Internet Explorer is a web browser.
A passage will always have multiple context which describes and defines the subject the writer wants to convey, even with few missing words, khurram can always read over the sentences prior and post the sentence with missing word to grasp the message of the passage. If the requirement was to be able to find the exact words, he would have to look for the original publication but to understand the passage he must read and be able to completely understand the context.