熬夜到很晚不是一个好习惯。

　　Passage 4限时：8分钟

　　体裁：夹叙夹议文　题材：人物心理类　难度：难词数：338

　　You may have been told before not to be afraid of anything. Fear is often associated with weakness. Fear is something to be avoided. But that's not true, according to Time For Kids magazine. Fear can be good for us. Fear tells us about danger. Without fear,

　　we wouldn't know to run away from a tiger or step back from a cliff (悬崖)．

　　In a study published in the Justice Quarterly journal in August, researchers from Michigan State University said that a healthy fear of crime keeps teenagers away from potentially dangerous people, places, and activities. Fear makes us jump, scream and sweat. But interestingly, sometimes we make ourselves feel fear on purpose. Think about scary books and movies, and also the long lines for a scary roller coaster ride (过山车)．

　　Margee Kerr, a US sociologist, explained why to Time For Kids. Fear fills our brain with healthy chemicals， especially endorphins and dopamine, and these things create feelings of happiness and excite us, according to Kerr. In addition, when you're scared， your body produces a chemical which helps people bond_with each other.

　　“Watch people walking out of a haunted house (鬼屋), and you'll see lots of smiles and high fives (击掌)，”

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