A central idea in The Code Book is the concern that much of the world’s information is not secure. Which lines from the passage best support this central idea? Check all that apply. it could be that the laws of mathematics forbid the existence of a significant shortcut
only a small fraction of the information flowing around the world is securely encrypted
companies are already supplying shielding material that can be used to line the walls of a room
few of these people take adequate precautions in terms of privacy
law enforcers and anybody else with a curious mind can get their hands on more information

Read the passage. the dust bowl during the 1930s, extreme drought and high winds made life incredibly difficult in the great plains region of the united states. in many areas, rainfall was forty percent less than normal. the soil became extremely dry, and when strong winds blew, they created tremendous dust storms. these so-called “black blizzards” were so thick that they made daylight seem like dusk. during this terrible period, the great plains region of the united states was named the “dust bowl.” over the next few years, the drought continued, and the winds created more dust storms. in some places, the drought and high winds lasted for eight years. many people wondered if the black blizzards would ever end. which statement about this paragraph’s main idea is true? this paragraph’s main idea is stated in the topic sentence. there are not enough details to support the main idea. this paragraph’s main idea is implied. this paragraph does not express a main idea.