题目

如图所示是一列简谐横波在某时刻的波动图象，从该时刻开始，此波中d质点第一次到达波谷的时间比e质点第一次到达波谷的时间早0.10 s.若b质点的平衡位置为x＝，求（1）至少经过多长时间b质点经过平衡位置且向下运动（2）b质点在上一问的这段时间内经过的路程是多少． 答案：根据波的传播方向与质点振动方向的关系，可知此波沿x轴正方向传播． 依题意λ＝4 m，T＝0.4 s 可得v＝ ＝10 m/s 这段时间等于-1m处的质点振动状态传播到b质点所用的时间 即 由波动图像可知b质点的纵坐标为 则这段时间通过的路程S=12.5cmI don’t like getting up too early unless I have to. When you’re filming, you’ve got make-up on, which doesn’t happen often. As I’m not filming at present I’ll get up at 8.30. Work normally means Matt coming over to my house about 10 am. We’re writing at the moment. We’ll chat for a bit before going to my study. One of us will have an idea for a sketch (梗概), we’ll talk about the characters and when we feel we have enough we’ll start writing. Matt and I met at the National Youth Theatre in 1990 and started doing shows together in ’95, at the Edinburgh Fringe festival. We know we’re onto something if we’ve made each other laugh, and that’s a really special moment. It’s not always like that, but we’re comfortable enough with each other that we can be honest and go. Some days you’re not in the mood to be funny—like writing when my dad was dying of cancer, or when Matt was separating from his partner. We stop for lunch and sometimes go to Wagamama in Camden, but the last time we were followed by paparazzi (狗仔队), which gets you down—who wants to be pictured eating noodles? When I’m not writing with Matt I work on other projects. My second children’s book comes out later in the year. It’s called Mr. Stink. The first one I dedicated to my three-year-old nephew, Eddie. Both books have been illustrated by Quentin Blake; it’s been a thrill to work with him—like 20 years ago reading a Roald Dahl book and looking at those drawings, then one day that person illustrates your work… magical. At 5 I go swimming in Soho. My trainer makes me do horrible exercises, but I always feel better after. Being in all day, I like to go out in the evening and look smart, but not like I’ve come out of the City. I’m a tall, broad guy and well-dressed. For dinner I’ll meet friends. When you’re a single guy it’s great to have some good female friends. Or I might take my mum to the theatre, as I know she really appreciates it. I like watching TV comedy shows to see what everyone’s doing. When you see something impressive it makes you work harder. I also love Larkin’s poems: they don’t try to transcend (超越) the commonplace; they’re much more straightforward. Poetry is great to dip into before going to bed, rather than falling asleep reading a novel and being confused over what you’ve read or not. I haven’t had a good night’s sleep in seven years; unfortunately, I rely on pills. I’ve tried everything. If I could wish anything for myself, I’d wish I could sleep better. 67. It can be inferred from the passage that _______. A. the author spends much time with his friends B. the author and Matt are both famous in the district C. the author doesn’t care much about what to wear D. the author works at home and seldom goes out every day 68. Where does the passage most likely appear? A. In a travel diary.                          B. In a news column. C. In an online diary.                    D. In a research paper. 69. Why does the author read some poetry before going to bed? A. Because poetry can often bring him some funny ideas. B. Because poetry is much easier to understand than novels. C. Because poetry is very abstract and reflects unusual things. D. Because poetry can be of some help for him to kill time. 70. What might be the best title for the passage? A. A day’s work with Matt                 B. A new life-style  C. A life in the day                       D. A good way to write