单项选择题

Paper industry needed a new source of fiber in the early 1800s is because ______.

A．people wanted higher quality paper
B．paper made from rags deteriorated too quickly
C．wood pulp had become too expensive
D．the supply of rags was insufficient

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单项选择题

What do you think is the best title for this passage

A．How Is Diamond Formed And Found.
B．Diamond--A Precious Stone.
C．Diamond Hunting.
D．Diamond-Producing Countries.

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.