题目

麦克斯韦在1865年发表的《电磁场的动力学理论》一文中揭示了电、磁现象与光的内在联系及统一性，即光是电磁波。一单色光波在折射率为1.5的介质中传播，某时刻电场横波图象如图1所示，求该光波的频率。图2表示两面平行玻璃砖的截面图，一束平行于CD边的单色光入射到AC界面上，a、b是其中的两条平行光线。光线a在玻璃砖中的光路已给出。画出光线B从玻璃砖中管次出射的光路图，并标出出射光线与界面法线夹角的度数。 阅读理解 　　There is a popular belief among parents that schools are no longer interested in spelling．No school I have ever taught in has ever ignored spelling or considered it unimportant as a basic skill．There are, however, different ideas about how to teach it, or how much priority(优先)it must be given over general language development and writing ability．The problem is, how to encourage a child to express himself freely and confidently in writing without holding him back with the complexities(复杂性)of spelling． 　　If spelling becomes the only focal(焦点的)point of his teacher's interest, clearly a bright child will be likely to“play safe”．He will tend to write only words within his spelling range, choosing to avoid adventurous language．That's why teachers often encourage the early use of dictionaries and pay attention to content rather than technical ability． 　　I was once shocked to read on the bottom of a sensitive piece of writing about a personal experience．“This work is terrible!There are far too many spelling errors and your writing is terrible．”It may have been a sharp criticism of the pupil's technical abilities in writing, but it was also a sad reflection on the teacher who had omitted to read the essay, which contained some beautiful expressions of the child's deep feelings．The teacher was not wrong to draw attention to the errors, but if his priorities had centered on the child's ideas, an expression of his disappointment with the presentation would have given the pupil more motivation to seek improvement． (1) Teacher are different in their opinions about ________． [　　] A． the difficulties in teaching spelling B． the role of spelling in general language development C． the complexities of the basic writing skills D． the necessity of teaching spelling (2) The underlined expression“play safe”probably means ________． [　　] A． to write carefully B． to do as teachers say C． to use dictionaries frequently D． to avoid using words one is not sure of (3) Teachers encourage the use of dictionaries so that ________． [　　] A． students will be able to express their ideas more freely B． students will have more confidence in writing C． teachers will have less trouble in correcting mistakes D． students will learn to be independent of teachers (4) The author seems to think that the teacher's judgment on that sensitive piece of writing is ________． [　　] A． unfair B． reasonable C． foolish D． careless (5) The major point discussed in the passage is ________． [　　] A． the importance of developing writing skills B． the complexities of spelling C． the correct way of marking compositions D． the relationship between spelling and the content of a composition