题目

在探究凸透镜成像规律的实验中，当烛焰、凸透镜、光屏位于如图所示的位置时，烛焰在光屏上呈现一个清晰的像，则下列说法正确的是 A．凸透镜的焦距可能是12cm B．照相机利用了这种成像特点 C．若在透镜和蜡烛之间放一片近视镜，光屏适当左移可再次出现清晰的像 D．蜡烛和光屏不动，透镜向光屏适当移动可再次出现清晰的像短文填词 (共10小题，每小题0.5分，分) 阅读下面短文，根据以下提示：1）汉语提示，2）首字母提示，3）语境提示，在每个空格内填入一个适当的英语单词，并将该词完整地写在右边相对应的横线上。所填单词要求意义准确，拼写正确。 If I have the honor to be c        to work for the                      1.____ Sixteenth Asian Games, I will first ________ (提高) my                           2.____ English so that I can talk easily ________ foreign visitors.             3.____ Secondly, I will learn m      about the history of the                4.____ Asian Games as _____ as the 2010 Asian Games. Third,                5.____ since I am __ (熟悉) with Guangzhou, I can help visitors find        6.____ their way in the city. ________, I should be able to tell                   7.____ visitors about our history and ________ (文化) and show              8.____ them our greatest achievements. In a ________, I will do             9.____ my best to help make the Games a                .                                   10.____