单项选择题

A. Because they're too expensive.
B. Because they were the first kind of balloon ever used.
C. Because they move very slowly.
D. Because they're rejected by the pilots.

A.
B.
B.
C.
C.
D.
D.

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A. Because they're too expensive.B. Because they were the first kind of balloon ever used.C. Because they move very slowly.D. Because they're rejected by the pilots.