阿摩線上測驗
8. When one space object crosses in front of another, the first object can sometimes block the view of the second. This process is called a(n) _____.
(A)umbra
(B)penumbra
(C)gibbous
(D)eclipse
答案：登入後查看
統計： A(5), B(3), C(11), D(54), E(0) #1342049
統計： A(5), B(3), C(11), D(54), E(0) #1342049
