【简答题】This “ noctilucent cloud ” occasionally appears when the earth is first cloaked in the evening darkness; shimmering above us with a translucent whiteness, these clouds seem quite unnatural. (Para. 7)
【单选题】Directions: Choose the one that best completes the sentence, or fully expresses the meaning of the given word. This "noctilucent cloud" occasionally appears when the earth is first cloaked in the even...
【简答题】翻译成中文:This "noctilucent cloud" occasionally appears when the earth is first cloaked in the evening darkness; shimmering above us with a translucent whiteness, these clouds seem quite unnatural.