题目

在三楼的阳台上，一人手拉着一只小球，小球下面由绳挂着另一小球．放手后让两球自由下落，两球相继落地的时间差为t 1 ，又站在四楼的阳台上，同样放手让两球自由下落，两球相继落地的时间差为t 2 ，则（ ）A. t 1 ＜t 2B. t 1 ＞t 2C. t 1 ＝t 2D. 无法比较 答案：【答案】B【解析】试题下落过程中两球的下落快慢一样，所以下面的小球落地时，上面小球距离地面的高度一定，如图所示，球相继落地的时间差即为此后上面小球下落一个绳长的高度的时间，释放高度越高，此时上面球的初速度越大，下落此段绳长的时间也就越短，所以B正确，ACD错误。The speaker, a teacher from a community college, addressed a sympathetic(赞同的) audience. Heads nodded in agreement when he said, “High school English teachers are not doing their jobs.” He described the inadequacies of his students, all high school graduates who can use language only at a grade 9 level. I was unable to determine from his answers to my questions how this grade 9 level had been established. My topic is not standards nor its decline(降低). What the speaker was really saying is that he is no longer young; he has been teaching for sixteen years, and is able to think and speak like a mature adult. My point is that the frequent complaint of one generation about the one immediately following it is inevitable. It is also human nature to look for the reasons for our dissatisfaction. Before English became a school subject in the late nineteenth century, it was difficult to find the target of the blame for language deficiencies (缺陷). But since then, English teachers have been under constant attack. The complainers think they have hit upon an original idea. As their own command of the language improves, they notice that young people do not have this same ability. Unaware that their own ability has developed through the years, they assume the new generation of young people must be hopeless in this respect. To the eyes and ears of sensitive adults the language of the young always seems inadequate. Since this concern about the decline and fall of the English language is not perceived(察觉) as a generational phenomenon but rather as something new and peculiar(特有的) to today’s         young people, it naturally follows that today’s English teachers cannot be doing their jobs. Otherwise, young people would not commit offenses against the language.1.The speaker the author mentioned in the passage believed that _____. A.the language of the younger generation is usually inferior(差的) to that of the oldergenerationB.the students had a poor command of English because they didn’t work hard enoughC.he was an excellent language teacher because he had been teaching English for sixteenyearsD.English teachers should be held responsible for the students’ poor command of English2.In the author’s opinion, the speaker ______. A.gave a correct judgment of the English level of the studentsB.had exaggerated(夸大) the language problems of the studentsC.was right in saying that English teachers were not doing their jobsD.could think and speak intelligently3.The author’s attitude towards the speaker’s remarks is ______. A.neutralB.positiveC.criticalD.compromising4.It can be concluded from the passage that ______. A.it is justifiable(有理由的) to include English as a school subjectB.the author disagrees with the speaker over the standard of English at Grade 9 levelC.English language teaching is by no means an easy jobD.language improvement needs time and effort5.In the passage the author argues that ______. A.it is unfair to blame the English teachers for the language deficiencies of the studentsB.young people would not commit offences against the language if the teachers did theirjobs properlyC.to eliminate(消除) language deficiencies one must have sensitive eyes and earsD.to improve the standard of English requires the effort of several generations