在“观察太阳光通过小孔在地面上形成的光斑”活动中，当挖有三角_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

在“观察太阳光通过小孔在地面上形成的光斑”活动中，当挖有三角形小孔的硬纸板距离地面较近时，地面上的光斑是______（圆∕三角）形的；当硬纸板距离地面较远时，地面上的亮斑是______（圆∕三角）形的．

答案

当小孔离地面较近时，由于光沿直线传播，此时不能形成小孔成像，所以地面上的光斑是跟小孔的形状相同，为三角形；当纸板距离地面较远时，由于光沿直线传播，地面上形成太阳的像，所以地面上的亮斑跟太阳的形状相同，为圆形；

故答案为：三角；圆；

完形填空

A school teacher decided to let her class play a game. The teacher told each child in the class to bring along a plastic bag containing a few    16  . Each tomato will be given a name of a person that the child    17  , so the number of tomatoes that a child will put in the plastic bag will depend on the number of people the child hates.
So when the day came, every    18   brought some tomatoes. Some had two; some three while some up to five tomatoes. The teacher then told the children to    19   with them the tomatoes in the plastic    20   wherever they go.
Days after days passed by, and the children started to complain due to the    21   smell let out by the rotten tomatoes. Besides, those having more tomatoes had to carry    22   bags. After 1 week, the children were relieved because the game had finally ended.
The teacher asked: “How did you    23   while carrying the tomatoes with you for 1     24  ?”
The children let out their frustrations and started    25   of the trouble that they had to go through having to carry the heavy and    26  tomatoes wherever they go.
Then the teacher told them the hidden meaning behind the    27  .
“This is exactly the    28   when you carry your hatred(憎恨) for somebody inside your heart. The unpleasant smell of hatred will pollute your    29   and you will carry it with you wherever you go. If you cannot tolerate the smell of rotten tomatoes for just 1 week, can you imagine what is it like to have the smell of hatred in your heart for your lifetime?”
So    30   others is that best attitude to take!

D．unimportant

B．complaining

C．information

B．understanding

单项选择题

在外科手消毒中，用手消毒剂揉搓双手（）

A.1~2min

B.2~3min

C.2~4min

D.2～5min

E.2～6min