Text Reading Level Cloze Test
One ancient evening, lost in the mists of time, someone looked into the sky and wondered for the first time: What are those lights? Where did plants and animals come from? How did I come __1__ be? Since then, humans __2__ tried to answer those __3__. At first, the answers __4__ ancestors came up with __5__ tales of magic __6__ legends. Then, slowly, humans __7__ to explore the natural __8__ using a scientific approach.
__9__ has several features that __10__ it different from other __11__ endeavors. First, science deals __12__ with the natural world. __13__, scientists collect and organize __14__ in a careful, orderly __15__, looking for patterns and __16__ between events. Third, scientists __17__ explanations that can be __18__ by examining evidence. In __19__ words, science is an __20__ way of using evidence __21__ learn about the natural __22__. The word science also __23__ to the body of __24__ that scientists have built __25__ after years of using __26__ process.
Science starts with observation. __27__ involves using one or __28__ of the senses--sight, __29__, touch, smell, and sometimes __30__--to gather information. The __31__ gathered from observations is __32__ evidence, or data.
Suppose a group of __33__ became ill with an unknown __34__ of infectious disease after __35__ a large public event. Health __36__ would want to know __37__ the people contracted the __38__. They might form several __39__. A hypothesis is a __40__ explanation for a set __41___ observations or an answer __42__ a scientific question. In __43__, a hypothesis is useful __44__ if it can be tested.
In science, testing a __45__ often involves designing an __46__. The factors in an __47__ that can change are __48__ variables. Examples of variables include equipment used, type of material, amount of material, temperature, light, and time. Scientist usually keep written __49__ of their observations, or data. In the past, data were usually recorded by hand, usually in notebooks or personal journals. Today, researchers may record their work on computers.
Scientists use the data from an experiment to evaluate their hypothesis and draw a __50__. That is, they use the evidence to determine whether the hypothesis was supported or refuted.