官方真题Official5托福听力Lecture2文本+真题+答案解析

官方真题Official5托福听力Lecture2题目文本

Question 1 of 6

What is the main purpose of the lecture?

A. To explain why scientists disagree about the age of the Moon.

B. To present arguments in favor of another Moon landing.

C. To explain how scientists discovered a crater on the far side of the Moon.

D. To review some finding of a recent mission to the Moon.

Question 2 of 6

What does the professor imply about the spacecraft Clementine?

A. It sent back the first color photographs of the Moon.

B. It was powered by solar energy.

C. It landed in the far side of the Moon.

D. It flew over the Moon’s polar regions.

Question 3 of 6

Why does the professor mention the Moon’s mantle?

A. To explain why scientists believe that meteor impacts cannot affect the Moon’s mantle.

B. To explain what kind of information scientists hope to obtain from the mantle.

C. To point out that the Moon’s crust and mantle are made of similar materials.

D. To point out that the Moon’s mantle and Earth’s mantle have different compositions.

Question 4 of 6

Why is the South Pole-Aitken Basin thought to be exceptionally old?

A. The walls of the Basin are more reflective than those of most other craters.

B. Testing of rocks from the Basin’s floor proves them to be as old as the Moon itself.

C. Many small craters have been detected at the bottom of the Basin.

D. A large amount of dust has been detected in and around the Basin.

Question 5 of 6

Why does the professor consider it important to find out if water ice exists on the Moon?Click on 2 answers.

A. Water ice could be processed to provide breathable air for astronauts.

B. One component of water ice could be used as a fuel for rockets.

C. Water ice could contain evidence of primitive life on the Moon.

D. Water ice could be tested to find out what type of meteors crashed into the Moon.

Question 6 of 6

What does the professor imply when he says this :

A. The current age estimates for the South Pole-Aitken Basin are based on incorrect assumptions.

B. The technology to analyze Moon rocks has not advanced much since the days of the Moon landings

C. Too few of the original Moon-rock samples were dated accurately

D. Only by testing samples from South Pole-Aitken Basin can its age be precisely determined

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