1. Imagine testing glass by throwing chickens at it! Sometimes
fast-moving airplanes fly through flocks of birds. If the birds hit the
windshield of a plane, the glass could shatter and cause a crash. Airplane
manufacturers have made a chicken cannon that fires rubber chickens
at glass windshields. If the windshield doesn't break when the rubber
chicken hits it, the designers know that the glass can withstand the
force of a real crash.
1. The story mainly tells
A. why birds can be dangerous to airplanes
B. how a chicken cannon tests glass
c. how big a bird has to be to damage an airplane
D. how the chicken cannon works
