问题 问答题

我们对人体吸入的空气和呼出的气体的探究时知道,人呼出的气体中含有二氧化碳、氧气、水,吸入空气中也含有二氧化碳、氧气、水.请你选择其中的一种物质完成下列科学探究:

人吸入的空气和呼出的气体有什么不同?
猜想(假设)______
实验______
证据______
结论与解释______
讨论______

答案

选择二氧化碳完成科学探究:

人吸入的空气和呼出的气体有什么不同?
猜想(假设)呼出气体中含有的二氧化碳气体比空气中的多
实验取一瓶空气,一瓶呼出的气体,各滴入澄清的石灰水,振荡
证据呼出气体使澄清的石灰水变浑浊,而空气使澄清石灰水没有明显变化
结论与解释呼出气体中含有的二氧化碳气体比空气中的多,原因是人的呼吸释放出二氧化碳气体
讨论还有没有其它的实验来验证呼出气体中含有的二氧化碳气体比空气中的多
故答案为:

人吸入的空气和呼出的气体有什么不同?
猜想(假设)呼出气体中含有的二氧化碳气体比空气中的多
实验取一瓶空气,一瓶呼出的气体,各滴入澄清的石灰水,振荡
证据呼出气体使澄清的石灰水变浑浊,而空气使澄清石灰水没有明显变化
结论与解释呼出气体中含有的二氧化碳气体比空气中的多,原因是人的呼吸释放出二氧化碳气体
讨论还有没有其它的实验来验证呼出气体中含有的二氧化碳气体比空气中的多

单项选择题
阅读理解

阅读理解

     I loved music when I was young. I learned to play the guitar at 11 and I wrote my first song four years

later. My dream was to become a country singer.

After years of hard work, a record company was showing interest in me. One day during a trip to

Nashcille, a friend offered me a bit of meth (一种兴奋剂).I didn't know then that meth is the easiest,

cheapest drug to get, and also one of the most addictive. So I smoked it and that was all I thought about

for the next year and a half .I couldn't live without it.

     When the police arrested me, I looked like death. The first seven days in prison, I just slept. when I

woke up on the eighth day, I had never known such shame and guilt. I walked down the hall to the pay

phone. My mum is the sweetest person on the planet, and I knew this was going to break her heart. When

I heard her voice on the phone, I told her where I was . She just said : "son, don't you know you can't do

anything to make me not love you?"

     Her words gave me the strength to face my trouble. And I also realized this was my chance to start a

new life.

     When people know my story, I hope they will not make the same mistake as I have, but I do know that

you can overcome almost anything, especially drug abuse. That's why I share my story here.

1. Which was the writer's favorite music when he was in his teens?

A. Rock music    

B. Classical music    

C. Jazz music  

D. Country music

2. How long was the writer addicted to drug?

A. About half a year    

B. About one year    

C. One and a half years  

D. Two years

3. The writers was put into prison most probably because he _____.

A. offered others drugs  

B. took drugs

C. stopped working with a record company

D. refused to pay off all his debts