English

Mr Kitty

4 May, 02:18

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

Which one