题干

小刚利用如图所示的装置进行探究“平面镜成像特点”的实验.实验步骤如下:

 

⑴将一块薄玻璃板竖直立在铺有白纸的水平桌面上;

⑵取两支相同的蜡烛A和蜡烛B,点燃玻璃板前的蜡烛A,并移动玻璃板后的蜡烛B,使它与蜡烛A在玻璃板后所成的像完全重合,并用笔在白纸上标记出蜡烛A和蜡烛B的位置;

⑶多次改变蜡烛A的位置,重复前面的步骤;

⑷用刻度尺分别测量蜡烛A和蜡烛B到玻璃板的距离.

在此实验中:

① 小刚选用玻璃板代替平面镜的目的是:____

② 选取两支相同的蜡烛是为了比较像与物的____关系;

③ 小红跟小明也做了这一实验,但实验过程中出现了问题。小红实验时无论怎样移动玻璃板后面的蜡烛,都不能与放在玻璃板前的蜡烛的像完全重合,其原因是____;小明透过玻璃观察蜡烛的像时,看到像的后面还有一个较模糊、与像有部分重叠的像,出现两个像的原因是____

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Some Most Common Senior Year Mistakes

    ____You'd better find out how to avoid these common mistakes. Finding a balance between having fun and studying for your courses is a great way to start preparing for college, since you will be called upon to do this during your college years.

    Here we've listed some top mistakes students make so that you can make sure you don't make them.

    Skipping Classes

    Skipping classes could mean missing valuable information for the coming tests.____ As is known to all, information you'll need for your major in your college program may be covered during a high school lecture you miss.

    Forgetting to Study

    When you feel less motivated to study, remind yourself that every good grade gets you closer to finding a college that offers a great program in the major you want. Keep your eyes on the prize!

    ____ To stay on top of your assignments, calculate how long you think something will take you, and then double it. That way you'll have ample time to get your work done.

    Daydreaming about Your Future Too Much

    Your mind now might be wandering, thinking around about degrees, majors, possible careers, study abroad and many other things. These are all exciting future possibilities, but don't forget the here and now.____

    Failing to Use Available Resources

    Teachers know about fall the challenges you're facing.

    ____This help can be in the form of extra office hours, a review of topics covered, study guides, sample exams, or other tools to help you improve your grade. Take advantage of them.

A. Start preparing for college

B. Mismanaging Your Time

C. Your senior year of high school is a busy time

D. And don't forget to think ahead to university classes

E. Almost every high school senior makes some mistakes.

F. Spending too much time daydreaming could seriously limit those future plans You

G. And many of them are nice enough to offer extra help.