托福TPO61听力原文+题目+答案解析：Listening L3

托福TPO试题基本所有参加托福考生必做试题，在下文中上海新航道托福培训小编整理了托福TPO61听力原文+题目+答案解析：Listening L3，希望对大家有所帮助！

TPO61Listening L3听力原文+题目

Listening L3

1. What is t he main tape of the lecture?

A.A method of packing coffee at high pressure and temperature

B.A method of decaffeinating coffee while preserving its flavor

C.Reasons why carbon dioxide is added to caffeinated soft drinks

D.The critical importance of carbon dioxide for the food industry

2. How does the professor organize the review of the phase diagram?

A.By using an example of water vapor gradually changing to solid ice

B.By showing phase changes that occur when pressure and temperature increase at the same time

C.By first showing temperature‐ induced phase changes and then showing pressure‐ induced phase changes

D.By first explaining the properties of gas and then introducing the properties of supercritical fluids

3.Under what conditions do super critical fluids form?

A.When a solid begins turning into a liquid

B.When a very hot gas is put under high pressure

C.When certain solids dissolve in certain liquids

D.When a liquid is allow temperature but under high pressure

4.What two properties of supercritical fluids does the professor mention?

Click on 2 answers

A.They can permeate solids

B.They dissolve other substances

C.They diffuse very slowly，just as liquids do

D.They have lo w densities at high pressures.

5.The professor describes a process of caffeine extraction from coffee beans using carbon dioxide (CO?) Put the steps of the process i n the correct order

Click on a sentence Then drag it to the space where it belongs. The first one is done for you

1 Super critical CO2 is led into a high‐pressure chamber

2.

3.

4.

5.

Answer Choices

Caffeine crystallizes

CO2 permeates the beans

The pressure is decreased

Caffeine dissolves

6.What does the professor imply when he says this

A.The process of caffeine extraction is less complicated than it sounds

B.More research needs to be done on supercritical fluids

C.He will explain what a supercritical fluid is to the class

D.Will not spend much time reviewing supercritical fluids

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