单项选择题

According to the passage, where did diamonds first come into existence

A．In the volcanoes.
B．On the floor of the sea.
C．Under the river bed.
D．At the foot of the mountains.
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单项选择题
Which of the following is NOT mentioned by the speaker
A．Diamond-producing rivers are located near the mountain sides.
B．Diamonds couldn’t be formed without great heat and pressure of the volcano.
C．Volcano explosions brought some diamonds up to the surface of the earth.
D．Explosions of the volcano can damage diamonds as well.
单项选择题
What is the woman doing
A．She is serving her guests.
B．She is singing songs.
C．She is working hard.
D．She is looking at the city.
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