It so happened that another test laboratory in a different part of the world was involved in assessing bird-strikes--in this case on the windshields and the drivers’ cabs(驾驶室) of new high-speed trains. The train test engineers had read about the pioneering test developed by the aerospace team, and so they approached them to ask for specifications of the gun and the testing methods. The aerospace engineers gave them details, and the train engineers set about building their own simulation.
The simulated bird-strike tests on the train windshields and cabs produced shocking results. The supposed high-speed train windshields offered little resistance to tile high-speed chickens; in fact every single windshield that was submitted for testing was struck to pieces, along with a number of train cabs and much of the test-lab itself.
The frightened train engineers were concerned that the new high-speed trains required a safety technology that was beyond their experience, so they contacted the aerospace team for advice and suggestions, sending them an extensive report of the tests and failures.
The brief reply came back from the aero-engineers: “You need to defrost (解冻) the chickens... “
24. The underlined phrase “colliding with” in the first paragraph can be replaced by _________.
A. hitting
B. catching
C. throwing
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