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17.
A. The plane is full.
B. The plane is late.
C. The plane has broken down.
D. The flight is canceled.
18.
A. All rooms are taken.
B. Many spare rooms are available.
C. There are only double rooms.
D. There is just a single room.
adj. 平的，与飞机有关的
n. 飞机，水平
