阿摩線上測驗
6. Each of the planets in the solar system circles around the sun in its own _____, and this prevents them
from colliding with each other.
(A) entry
(B) haste
(C) orbit
(D) range
答案：登入後查看
統計： A(2), B(5), C(32), D(10), E(0) #2737453
統計： A(2), B(5), C(32), D(10), E(0) #2737453
