[解析]
(1)C.推理判断题。根据前句If you stayed up or had a bad night of sleep last night,you know it's difficult to stay awake in class today.Your teacher's voice might begin to sound like a lullaby(催眠曲)。你熬夜后课上很困,老师的声音像催眠曲一样,C项:If so,classrooms can be boring because you're tired.(如果是这样的话,教室可能是无聊的因为你累。)是讲述课堂上的感受,符合语境,故选C.
(2)F.联系上文题。根据前文Sit in the front of the room.Why?坐在教室前面。为什么?F项:You'll be more motivated to stay awake if you know that the teacher can see you easily.如果你知道老师很容易看到你,你会更有动力保持清醒,符合文意,故选F.
(3)A.段落理解题。根据后文Ask and answer questions and pay attention to the lecture.提问和回答问题,注意听课。A项:Participate in class activities.参加课堂活动,符合文意,故选A.
(4)E.语境辨析题。根据前文It might be helpful to make a goal for yourself to answer or ask at least 3 questions per class.给自己定一个目标,每堂课至少回答或问3个问题可能有帮助。E项:To avoid annoying your teacher you should try to keep your questions on topic.为了避免让你的老师生气,你应该试着把问题放在话题上,符合文意,故选E.
(5)G.文章衔接题。根据本段的主题句Listen actively to the lesson.课上要积极地听也是保持注意力集中的一种方法,G项:Practicing active listening can help you keep your eyes open for the length of the lesson.(练习积极的倾听可以帮助你在整个课程中保持睁大眼睛。)介绍的是积极听的作用,符合本段文意,故选G.