B.unless C.when
D.because 解析:选D。根据语意看,后面的句子表示“没有必要的原因”,所以用because。 本部分内容讲解结束 按ESC键退出全屏播放 辨析puzzle/question
puzzle 令人迷惑的、难以理解或回答的问题。 question 主观提出的或需解决、决定的问题。 ①(牛津P1616)What puzzles me is why he left the country without telling anyone. 令我不解的是,他为什么悄悄地离开了这个国家。 ②The police are still puzzling_about/over how the accident could have happened. 警察仍然正在苦思这起事故是怎么发生的。 ③Scientists have been trying to solve this puzzle for years. 多年来科学家们一直试图解开这一谜团。 ④(牛津P1616)He looked puzzled so I repeated the question.他好像没听懂,于是我又把问题重复了一遍。 3pull n. & vt.
拉(力);拖;牵引力 (教材P30)As the rocket rose into the air,we were pushed back into our seats because we were trying to escape the pull of the earth’s gravity. 随着火箭的升空,由于我们在努力挣脱地球的引力,我们被向后推在座位上。 pull down拆毁;摧毁 pull in(车辆)进站停靠;靠边停靠 pull out驶出;退出 pull through康复;痊愈 归纳拓展 ①He pulled the door open and rushed out. 他拉开门,冲了出去。 ②(牛津P1604)The police car signalled to us to pull_in. 警车发出信号,要我们驶向路边停靠。 ③We waved as the train pulled out of the station. 火车驶出车站时我们挥手告别。 ④The doctor told me that I would pull_through. 医生告诉我,我会康复的。 【助记】 跟踪训练 Ⅰ.选词填空 system;harmful;exist;climate;pull 1.I consider it ________ for students to play computer games. harmful 2.As far as I know,they are paid hardly enough to _______ on. 3.A focus and concern on ________ change is entirely appropriate. exist climate 4.You have to enter your password before entering this ______. 5.Cheer up!Take more exercise every day and you will
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