题干
Helen上课总感觉疲倦，你建议她：
A：You should stay up late.
B：You should go to bed early.
答案(点此获取答案解析）
B
Helen上课总感觉疲倦，你建议她：
A：You should stay up late.
B：You should go to bed early.
是三角形
的两个锐角，且
则△