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A. nurses
B. teachers
C. doctors
D. parents

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A. your room key card
B. to ask for a specific key
C. to be a guest on the third floor
D. to go between 6:00AM and 8:00PM

A. 可燃物少
B. 缺氧
C. 温度低
D. 温度高

A. CO
B. CO2
C. O2
D. O3

A. like
B. willing
C. lovely
D. impatient