critical

definition: 
very serious or unsafe; urgently needed; marked by a tendency to find and call attention to errors and flaws
sentence: 
We expect schools to educate our children to become critical consumers of internet services and electronic media.
While vitamin D is critical for many body systems, including bones and the brain, recent studies that have tested these assumptions haven’t been reassuring.
difficulty: 
easy
toefl frequency: 
2
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