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What invention made air combat more possible and more deadly during World War I?
Lighter planes that didn't need to be refueled as often as older models
Machine guns timed to fire between revolving propeller blades
Pressurized cabins that allowed pilots to fly at higher altitudes
more quizzes

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What subjects should your child be studying in school? World Book's Typical Course of Study offers general curriculum requirements for students in preschool through high school.

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Learn about the history of African Americans.
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