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A. In front of the check-in. B. At the departure gate.
C. In a ship. D. On a plane.
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In effect
单项选择题
The underlined words these developments in paragraph 2 most probably refer to ______.
A. the acts of violence against scientists
B. the use of animals in research
C. the techniques of planting bombs in cars
D. the establishment of new animal protection organizations
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