Conversation 1
Teacher: Shh! Listen carefully!
[3-second beep at about 40 kHz]
Teacher: Did you hear that? No? How about this?
[3-second beep at about 17.4 kHz]
Teacher: If you couldn't hear the first one, it means you're not a dog! [Laugh.] Dogs can hear very 1.
high frequencies
, but people can't. And if you could hear the second one, you're younger than 25.
Student: Wow! Why is that?
Teacher: Our ears change when we get older. Children and young people can hear the second one, but most people 2.
over 25
can't.
Conversation 2
Teacher: Today's topic is "Should teenagers date?" Team A, please begin.
Team A: We say no, they shouldn't. One reason is that 3.
teenagers are too young
. They should think about schoolwork and spend more time studying.
Team B: We don't agree with Team A. Our answer is "Yes". Teenagers can date if they want. It is quite 4.
normal
for a teenager to feel he or she likes somebody. We think it's possible for teenagers to 5.
balance dating and studying
at the same time.
