1) What is this book mainly about? a) How to play tag with your friends b) How fast cars travel on a highway c) How the brain controls our body systems 2) What happened right after a friend tags my arm and makes me "it"? a) Nerves in my arm send a message to my brain. b) My brain sends a message to my legs to run. c) I run after my friend to tag her back. 3) The author's purpose of writing this book is ....... a) to answer a question about how tag is played. b) to describe all the systems in the human body. c) to explain how the brain works. 4) The writer includes details about a game of tag to ....... a) answer a question about who is "it". b) explain how the brain sends and receives messages. c) describe what the brain looks like. 5) The word skull means a) the bones that surround the brain and make up the head and face b) groups of organs in the body that work together c) information or signals passed from one person or place to anotger

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