科学研究表明声的传播与光的传播非常相似，都可以发生反射和折射_爱下问搜题

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问题填空题

科学研究表明声的传播与光的传播非常相似，都可以发生反射和折射，烈日炎炎，在沙漠中两个相距不太远的人也难以听清对方的大声喊叫,就此现象请提出一个值得探究的问题:_______________________________________________________。

答案

温度高低的不同会造成空气密度不均匀吗？（其它答案合理得分）

题目分析：科学探究题的步骤是：一、提出问题。二、猜想与假设。三、制定计划与设计实验。四、进行实验与收集证据。五、分析与论证。六、评估。发现问题和提出问题是进行科学探究的前提。同学们要学会从题中所给的条件及日常生活、自然现象或实验现象的观察中发现与物理学相关的问题。解答此类问题的关键词是：为什么？怎么样？是什么？有什么规律？等等。

单项选择题

霍乱的典型临床症状为

A．剧烈泻、吐米泔样物，严重脱水，肌肉痉挛、周围循环衰竭
B．剧烈泻、吐米泔样物，高热，严重脱水，肌肉痉挛、周围循环衰竭
C．剧烈泻、吐米泔样物，腹痛，严重脱水，肌肉，痉挛、周围循环衰竭
D．剧烈泻、吐米泔样物，高热，腹痛，严重脱水及周围循环衰竭
E．剧烈泻、吐米泔样物，腹痛，严重脱水，脑水肿，周围循环衰竭

完形填空

完型填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上涂黑。
It was only a few weeks after my surgery. I went to Dr. Belt’s office for a     36   . it was just after my first chemotherapy treatment（化疗）. My scar was still very tender.    37  , I was taken to an examination room to have my blood    38  , again – a terrifying process for me, since I’m so frightened of    39  .
I lay down on the    40  . Then Ramina entered the room. Her   41  smile was familiar, and    42 in contrast to my fears. I’d first seen her in the office a few weeks earlier. She wasn’t my   43  on that day, but I remember her because she was laughing. What could she    44 find to laugh about at a time like this? So I decided she wasn’t   45 enough about the whole thing.
But this day was    46  . Ramona had taken my blood before. She   47 my fear of needles, and she kindly   48   the medical equipment under a magazine. As we opened the layers of bandage, the    49 scar on my chest could be seen.
She gently    50  over and ran her hand across the scar,   51 the smoothness of the healing skin. I began to cry gently and quietly. She brought her warm eyes to mine and said, “You haven’t    52 it et, have you?” And I said, “No.”
I continued to cry gently. In   53 tones she said, “This is part of your body. This is you. It’s okay to touch it.” But I couldn’t. So she touched it for me. The 54 . The healing wound. And beneath it, she touched my heart.
That night as I lay down, I gently placed my hand on my chest and I left it there 55 I fell asleep. I knew I wasn’t alone.

A．prescription

C．conversation

D．In addition

A．operation table

B．office floor

C．examining bed

A．accidentally

B．particularly

A．talked about