問題詳情

【題組】49. Why is NASA doing research at the stations?
(A) To gain valuable knowledge.
(B) To test theories about the universe.
(C) To reduce its labor costs.
(D) To provide assistance for AAD.

參考答案

答案：A
難度：簡單0.714286
統計：A(10),B(4),C(0),D(0),E(0)