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17.When a spacecraft travels, one of the major problems is reentry into the Earth’s _______.
A. surface
B.atmosphere
C.attitude
D.bent
18.This river forms a natural _______ between China and Korea.
A. boundary
B.string
C.spot
D.zone
19.She is already 16years old. But she _______as if she were still a little girl.
A. believes
B.absorbs
C.accrses
D.behaves
17.D 18.D 19.A