The Pont du Gard mentioned in paragraph 2 has all of the following characteristics EXCEPT
A．It was an aqueduct.
B．It is still being used.
C．It was built 2000 years ago.
D．It was repaired recently.

How does Angel Falls get its name？
A．A scientist named it Angel Falls.
B．It's named after an American pilot who first discovered it.
C．An American expedition named it Angel Falls.
D．No one knows.

听力原文：M: The quality is not bad. Will you quote me the price with a 3 percent commission？ You know we are commission agents.
W: OK. We'll consider that.
M: Will you please sent by air a half-yard sample cutting to our office？
W: Yes, we'll do that right away.
M: I'll cable home and see whether a trial order is possible.
W: Could you give us an early reply？ As the article is in great demand, I hope you won't miss the opportunity.
M: I see. I don't think it'll be long before you have our reply.
（8)
A．2%.
B．3%.
C．4%.
D．5%.

The word assumed in the passage is closest in meaning to
A．agreed
B．supposed
C．revealed
D．expressed

According to paragraph 3, what is the advantage of a barrel vault？
A．It was used in the Middle Ages.
B．Many arches were joined.
C．The space was larger.
D．It was a typical Roman look.

According to the passage, it will be difficult to predict weather
A．unless we learn more about chaotic systems
B．because we don't have enough weather stations
C．without more powerful computers
D．until we understand the physical laws of atoms