听下面一段独白，回答第1至3题。 1. What is the talk mainly about? [ &n

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听下面一段独白，回答第1至3题。

1. What is the talk mainly about?

[ ]

A. The history of life on Earth
B. Why there is life on Earth.
C. How life on Earth began.

2. What is necessary for life on Earth according to the speaker?

[ ]

A. Water, temperature and rock.
B. Water, oxygen and plants.
C. Temperature, gas and plants.

3. Which of the following does the speaker believe?

[ ]

A. Earth is the only planet with life.
B. People must protect their planet.
C. Mars is too hot to have life.

1-3: B A B

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