阿摩線上測驗
10. The junk floating in outer space poses a great danger to both astronauts and their spacecraft.
(A) potential
(B) process
(C) probability
(D) problem
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統計： A(42), B(33), C(36), D(136), E(0) #3060392
統計： A(42), B(33), C(36), D(136), E(0) #3060392
