Passage One Questions 11 to 13 are based on the passage you have just heard. What will passengers be asked to do when they travel to the moon（）
A. Go through a health check.
B. Carry little luggage.
C. Arrive early for boarding.
D. Undergo security checks.
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What should a person do before entering a pie-eating contest（）
Avoid eating any food.
B. Prepare the right type of pie to eat.
C. Wash his hands thoroughly.
D. Practice eating a pie quickly.
Only after they had performed hundreds of experiments did they succeed in (solve) ______. the problem.
公安赔偿是国家赔偿的一种，包括公安行政赔偿和__________。
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