Have you ever heard an echo of your voice?
An echo is a reflected(反射)sound. Stand in a very large, empty hall with nothing on the walls. Then shout. The sounds you make will hit the walls and come back to you. The walls reflect the sounds. These reflected sounds are called “echoes”.
We can use reflected sound to make sound travel farther. Hold a watch about fifty centimeters from your ear. You cannot hear it. The sound of the watch travels a short way in all directions. It does not travel as far as your ear. You can make it travel to your ear by using a roll of cardboard(纸板筒).
Make the roll of cardboard about fifty centimeters long. Put one end over your ear and hold the watch at the other. Now you can hear the watch because the sound has not gone in all directions. It is reflected down the roll to your ear.
A megaphone(喇叭筒)works in the same way. It makes sound travel farther. It reflects the sound into a beam which can travel a long way. In the ship, the sailor uses the megaphone to make his voice travel. Without the megaphone, his voice cannot travel far.
We use reflected sound in many ways. We use it to measure the depth of the sea, for example. Among the animals, bats and whales use reflected sound to tell them where they are and what things are near them.
【小题1】 Which is the right order of hearing our echo in a very large, empty hall?
a. We hear the reflected sound       b. The sound returns to us  
c. The sound hits the walls          d. We make a sound

                   Foreign Teachers Wanted

Age: 30—40

From: America, England & Australia

Careful and patient with a teacher’s licence

Good at both spoken and written English

At least five years’ teaching experience in high schools

Come for an interview before August 15^th

Address: No. 39 Lakeside Road

Tel: 0591-8780519

E-Mail : sis2009@yahoo.com

1. What job is wanted above?

        A. Cooks      B, Drivers       C. Teachers

2.__________ will probably get the job.

A.  An English lady at the age of 27.

B.  A woman who is good at French

C.  An Australian of 35 with a teacher’s licence.

3.What is not mentioned ?

          A. Age       B. Pay         C. Address

4.If a foreigner wants to have an interview, he or she should make it ________ .

5.What do you think it is ?

          A. An ad      B. An article      C. A film

                   Foreign Teachers Wanted

Age: 30—40

From: America, England & Australia

Careful and patient with a teacher’s licence

Good at both spoken and written English

At least five years’ teaching experience in high schools

Come for an interview before August 15^th

Address: No. 39 Lakeside Road

Tel: 0591-8780519

E-Mail : sis2009@yahoo.com

1. What job is wanted above?

        A. Cooks      B, Drivers       C. Teachers

2.__________ will probably get the job.

A.  An English lady at the age of 27.

B.  A woman who is good at French

C.  An Australian of 35 with a teacher’s licence.

3.What is not mentioned ?

          A. Age       B. Pay         C. Address

4.If a foreigner wants to have an interview, he or she should make it ________ .

5.What do you think it is ?

          A. An ad      B. An article      C. A film

Your junior high school years are coming to an end. After the big exam，most of you will go to   36  in a senior high school.  37  are you expecting from senior high?   38  hear what plans some students have for the future.
1.Zhou Jie，15，from Shanghai，“I have heard that although Senior 3 is a   39  year，students feel less stressed out in Senior 1 and Senior 2.I hope there’ll be time to enjoy   40 ，especially tennis. The Tennis Masters（大师）Cup will be held in Shanghai. I’m going to volunteer to help out and I’m sure I’ll really enjoy it.”
2.Jin Li，16，from Harbin，“I really enjoy science. I’m crazy about   41  model planes，although I’m not good at   42 .I’ll learn more science in senior high. Anyway. sometime in the future I’m going to build a super model plane!”
3.Wang Ya，15，from Xiamen，“I hope I can be   43 in senior high school. I’m only 155 cm. I want to be 162 cm.  44   most of the girls in my family don’t grow any taller than 160 cm. I hope I’m different.”
4.Li Fan，15，from Puyang，“I hope I can make more friends. In senior high. I’ll meet different people from different areas. I hope I can learn new things   45  them.”

Have you ever heard an echo of your voice?
An echo is a reflected(反射)sound. Stand in a very large, empty hall with nothing on the walls. Then shout. The sounds you make will hit the walls and come back to you. The walls reflect the sounds. These reflected sounds are called “echoes”.
We can use reflected sound to make sound travel farther. Hold a watch about fifty centimeters from your ear. You cannot hear it. The sound of the watch travels a short way in all directions. It does not travel as far as your ear. You can make it travel to your ear by using a roll of cardboard(纸板筒).
Make the roll of cardboard about fifty centimeters long. Put one end over your ear and hold the watch at the other. Now you can hear the watch because the sound has not gone in all directions. It is reflected down the roll to your ear.
A megaphone(喇叭筒)works in the same way. It makes sound travel farther. It reflects the sound into a beam which can travel a long way. In the ship, the sailor uses the megaphone to make his voice travel. Without the megaphone, his voice cannot travel far.
We use reflected sound in many ways. We use it to measure the depth of the sea, for example. Among the animals, bats and whales use reflected sound to tell them where they are and what things are near them.
【小题1】What is called “echo”?