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(B) To demonstrate the use of new measurement device.
(C) To explain the answer to an examination question.
(D) To provide background for the next reading assignment.
48. (A) They occur at regular intervals.
(B) They can withstand great heat.
(C) They travel through the Earth's interior.
(D) They can record the Earth's internal temperature.
49. (A) When the Earth was formed.
(B) The composition of the Earth's interior.
(C) Why lava is hot.
(D) How often a volcano is likely to erupt.
50. (A) How deep they are.
(B) Where earthquakes form.
(C) How hot they are.
(D) What purpose they serve.
PART A
1. --Have you saved enough to buy that new printer for your computer yet?
--You know money seems to be burning a hole in my pocket lately. Maybe next month.
--What does the man mean?
2. --We need a fourth player for tennis this morning. Do you want to join us?
--I've got a class at 9. But Carol is free and she is really good.
--What does the man suggest the woman do?
3. --I don't understand how this budget was calculated.
--Let me have a look, OK?
--What does the woman mean?
4. --I'm going to the snack bar for a cup of coffee. Would you like me to bring you back something?
--Not from the snack bar. But could you pick up a paper for me?
--What does the man mean?
5. --I'll be coming straight from work so I'll have to pack a change of clothes.
--It's only a barbecue. Jeans and T shirt will be fine.
--What does the woman imply?
6. --I'm exhausted. I stayed up the whole night studying for my history midterm exam.
--Why do you always wait till the last minute?
--What can be inferred about the man?
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