问题 选择题

如图a、b所示,是一辆公共汽车在t=0和t=3s末两个时刻经过同一路牌的两张照片.当t=0时,汽车刚启动,在这段时间内汽车的运动可看成匀加速直线运动。图c是车内水平横杆上用轻绳悬挂的拉手环经放大后的图像,轻绳与竖直方向的夹角为θ=37O.根据题中提供的信息,能计算出的物理量有(g=1Om/s2)

A.汽车的长度

B.图时刻汽车的速度

C.3s内汽车的加速度

D.3s内汽车所受合外力

答案

ABC

根据细线的偏转可知:

汽车做匀加速:,A对;

,B对;C对;

因为不清楚汽车的质量,所以无法确定合力,D错。

完形填空

In the old days of publishing, getting your manuscript into the hands of an editor often meant mailing the unsolicited finished product to the offices of literary agents or editors, where it would receive a cursory look from an editorial assistant — or none at all.

A modern version of the slush pile is the online “writing community,” a Web site where aspiring novelists can post their ideas, writing samples or manuscripts and open them to comments and reviews from strangers. On Tuesday Penguin Group USA, the publisher of Tom Clancy, Kathryn Stockett and Nora Roberts, will unveil its own venture, Book Country, a Web site for writers of genre fiction. In its initial phase Book Country will allow writers to post their own work — whether it’s an opening chapter or a full manuscript — and receive critiques from other users, who can comment on points like character development, pacing and dialogue. Later this summer the site will generate revenue by allowing users to self-publish their books for a fee by ordering printed copies. (The books will bear the stamp of Book Country, not Penguin, and the site is considered a separate operation from Penguin.) The site will also explain the business of finding an agent, marketing and promoting a book, using social media and handling digital and subsidiary rights.

Penguin hopes the site will attract agents, editors and publishers scouting for new talent, and allow writers to produce work with more polish and direction than they could otherwise. The project has been spearheaded by Molly Barton, the director of business development for Penguin and the president of Book Country. “One of the things I remember really clearly from my early editorial experiences was this feeling of guilt,” Ms. Barton said in an interview. “I would read submissions and not be able to help the writer because we couldn’t find a place for them on the list that I was acquiring for. And I kept feeling that there was something we could do on the Internet to really help writers each other.”

小题1: How did an author send unsolicited finished products to editors in the old days of publishing? _______________________________________________

小题2: The online “writing community” is where aspiring novelists post their ideas and ___________________________________________________________________________

小题3:The site uses social media and digital and subsidiary rights to _______________________.

小题4:What’s the real purpose of Penguin creating the web site? _______________________________________________

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