問題詳情
【題組】53．The underlined words“this fact”in Paragraph 3 refer to the fact that____．A．it costs a lot to test a planeB．the wings are not good enoughC．some problems are found with a planeD．the wings meet the high-speed air flow in the tunnel
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)