問題詳情

【題組】.18
(A) Here lasers are used for alignment.
(B) And that is where the laser comes in.
(C) And that is why we need the light.
(D) But how could they be encouraged?

參考答案

答案：B
難度：適中0.5
統計：A(1),B(3),C(1),D(0),E(0)