Answer the questions（根据短文内容回答下列问题)
Your Nose is Busy and Important
Your nose has many important jobs, and is always busy.
Smelling
Smelling helps you gather information about the world around you. A good scent (气体),like flowers, brings you pleasure. A bad scent, like smoke or sour milk, warns you of danger. Most things around you release scent particles (微粒) into the air. These invisible chemicals enter the nose when you breathe. Nerves in the nose send information to the brain to identify a smell. You are able to recognize thousands of smells.
Breathing
Most of the air you breathe enters through your nose. The nose uses hair and mucus (粘液) to clean dust and germs (细菌) out of the air. The air that enters your nose contains oxygen. Your body uses oxygen to unlock the energy in the food you eat.  Even when you sleep, your body needs energy to keep your heart beating and your brain working.
Tasting
Your nose helps you enjoy food. Flavor is a mixture of taste and smell. The smell of the food helps you identify what you are eating. The sense of smell contributes more to (贡献) food flavor than the sense of taste .When you are sick and have a stuffy nose, your food doesn’t taste as good because without smell, food loses most of its flavor.
Smell memory
Smells can bring back memories. Your brain uses a process to create a picture in your mind from the odors(气味)you smell. Smells can affect your feelings because the part of the brain that helps you identify smells is close to the area that affects your emotions, mood and memory. More smell memories are collected as you get older.
Your nose has many important jobs, and is more than just a smeller!
【小题1】How many important jobs does a nose do according to the passage? What are they?
【小题2】Smelling helps you recognize thousands of smells, doesn't it?
【小题3】What does the nose use to clean dust and germs out of air?
【小题4】What happens to your food if you are sick and have a stuffy nose?
【小题5】How do smells bring back memories?
【小题6】What do you think of your nose? Why do you think so?
Answer the questions（根据短文内容回答下列问题)
Your Nose is Busy and Important
Your nose has many important jobs, and is always busy.
Smelling
Smelling helps you gather information about the world around you. A good scent (气体),like flowers, brings you pleasure. A bad scent, like smoke or sour milk, warns you of danger. Most things around you release scent particles (微粒) into the air. These invisible chemicals enter the nose when you breathe. Nerves in the nose send information to the brain to identify a smell. You are able to recognize thousands of smells.
Breathing
Most of the air you breathe enters through your nose. The nose uses hair and mucus (粘液) to clean dust and germs (细菌) out of the air. The air that enters your nose contains oxygen. Your body uses oxygen to unlock the energy in the food you eat.  Even when you sleep, your body needs energy to keep your heart beating and your brain working.
Tasting
Your nose helps you enjoy food. Flavor is a mixture of taste and smell. The smell of the food helps you identify what you are eating. The sense of smell contributes more to (贡献) food flavor than the sense of taste .When you are sick and have a stuffy nose, your food doesn’t taste as good because without smell, food loses most of its flavor.
Smell memory
Smells can bring back memories. Your brain uses a process to create a picture in your mind from the odors(气味)you smell. Smells can affect your feelings because the part of the brain that helps you identify smells is close to the area that affects your emotions, mood and memory. More smell memories are collected as you get older.
Your nose has many important jobs, and is more than just a smeller!
【小题1】How many important jobs does a nose do according to the passage? What are they?
【小题2】Smelling helps you recognize thousands of smells, doesn't it?
【小题3】What does the nose use to clean dust and germs out of air?
【小题4】What happens to your food if you are sick and have a stuffy nose?
【小题5】How do smells bring back memories?
【小题6】What do you think of your nose? Why do you think so?
小明在表演二胡时，首先需要调整琴弦的松紧程度，他这样做的目的是改变琴声的  （填“响度”或“音调”）。用弓拉动琴弦，使琴弦  而发声；小明不断用手指去控制琴弦长度，这样做的目的是为了改变声音的  ；二胡的声音是通过  传播到我们耳中的
2004年12月26日，在印度洋发生里氏9级地震，引发了巨大的海啸，有几十万人遇难。这次灾难之后，国际上加强了对海啸预警系统的研究和建设。地震发生时会产生次声波，已知次声波在水中的传播速度是1500m/s，若某次海啸发生的中心位置到最近的陆地距离是300Km，海浪推进的速度是200m/s，则岸上仪器从接收到地震发出的次声波到海啸巨浪登陆的时间是　　s
学习了《声音的特性》后，小明和他的同学设计了以下几个探究实验：
甲：吹笛子时，手指按住不同的孔发出的声音不同。
乙：用医用听诊器了解人的心脏跳动的情况。
丙：用二胡和小提琴同时演奏《二泉映月》。
丁：使正在发音的音叉接触水面，水面溅起水花。
你认为能探究影响声音特性的实验有哪几个？各探究了哪些特性？其它实验虽然不是影响声音特性的因素，它们分别说明了什么？
在百米赛跑中，站在终点的计时员，假如在听到枪声时才计时，他记录下来的成绩有多大的误差？（当时空气中的声速为340 m/s）
第一次测定声音在水中的传播速度是1827年在日内瓦湖上进行的，两只船相距     14 km，在一只船上实验员向水里放一口钟，当他敲钟的时候，船上的火药同时发光；另一只船上的实验员向水里放一个听音器，如图所示，他看到火药发光后10 s听到了水下的钟声.计算一下水中的声速是多大？
第一次测定铸铁里的声速是在巴黎用下述方法进行的：在铸铁管的一端敲一下钟，在管的另一端听到两次响声，第一次是由铸铁传来的，第二次是由空气传来的.管长913 m，两次响声相隔2.5 s,如果当时空气中的声速是340 m/s，求铸铁中的声速
中央人民广播电台和北京电视台同时转播首都剧场的音乐会实况.首先欣赏到节目的究竟是剧场里离演奏者10 m以外的观众呢？还是远在1000 km以外的上海无线电听众或电视观众呢？
两个悬挂的通草球发生相互作用如图所示, 下列说法中正确的是: ［ ］
A．两球一定带异种电荷B．两球一定带同种电荷
C．两球可能均不带电D．可能一球带电, 另一球不带电
 0  65639  65647  65653  65657  65663  65665  65669  65675  65677  65683  65689  65693  65695  65699  65705  65707  65713  65717  65719  65723  65725  65729  65731  65733  65734  65735  65737  65738  65739  65741  65743  65747  65749  65753  65755  65759  65765  65767  65773  65777  65779  65783  65789  65795  65797  65803  65807  65809  65815  65819  65825  65833  235360 

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网