问题 单项选择题

One day a rich woman lost her purse with a lot of money in it. So she made a (1) , "If anybody finds my purse and (2) it to me, I’ll give half the money to him."A poor man (3) the purse near a shop. He sent it back to the woman, but the rich woman (4) . "There was an expensive ring in my purse besides money," said the woman, "I won’t give you half the money in my purse until you return it to me." "But I’ve never seen an expensive ring in (5) purse," said the man.They began to quarrel. The man became (6) and took her to a judge. (7) the judge heard what had happened to them, he said to the woman, "I’m sure that you have lost a purse, and there is an expensive ring in it. But there is (8) a lot of money in this purse. So I don’t think it’s yours. (9) some time. Maybe somebody will give your purse back."Then the judge (10) to the man and said, "Take the purse home. If the owner doesn’t come to get it back in two days, it will be yours.

 

第(10)空应选择()

A.ran

B.came

C.went

D.turned

答案

参考答案:D

解析:

根据生活常识,法官不会走过来也不会跑过去,而应是转向男人。

实验题

我们都做过“探究凸透镜成像规律”的实验,下图是该实验的装置图。

【测量凸透镜的焦距】

(1)将凸透镜正对着太阳光,在透镜的另一侧移动光屏,在距透镜10cm处,屏上呈现出最小最亮的光斑,则此凸透镜的焦距约为__________cm。

【评估实验方案】

方案甲:分别把点燃的蜡烛放在一倍焦距f和二倍焦距2f处,调整光屏到凸透镜的距离,观察并记录在屏上能否成像以及所成像的特点,分析总结得出凸透镜成像的规律。

方案乙:除甲中的做法外,还应该把蜡烛放在大于2f的某一位置,大于f小于2f的某一位置,观察并记录对应的成像情况,才能总结得出凸透镜成像的规律。

方案丙:把点燃的蜡烛从距凸透镜较远的位置逐渐移近,通过不断调整光屏到瓣距离,观察并记录在屏上能否成像以及所成像的特点,包括观察所成像随蜡烛位置变化变化的趋势,尤其是在f和2f处所的成像情况,总结得出凸透镜成像的规律。

方案丁:与丙不同的是,将蜡烛从靠近凸透镜的位置逐渐远离,其他步骤相同。

(2)以上四种方案中,哪些是科学合理的?________________________________。

【解决实验中的问题】

(3)小莉同学实验时,发现烛焰在光屏上的像偏高,如图所示,若要使烛焰成像在光屏中心,只调节光屏,应将光屏向_________调节。

(4)小丽同学实验时,发现无论怎样调节光屏的位置,都不能在光屏上呈现清晰的像。请你写出两种可能的原因:

① __________________________________________________;

②__________________________________________________。

单项选择题