試題詳解

44. What is the main idea of this passage?
(A) Geoengineers are taking the step to build a large sun-shade.
(B) We do not have much time for geoengineering debate.
(C) The debate over whether humans can possibly take control over climate change.
(D) Global warming can be monitored.
(E) Planetary sunshade construction is a cutting-edge technology.