新视野视听说教程第二册quiz5(10)

新视野视听说教程第二册quiz

19. What is true about the Alaskan spill?

A. More otters were killed than birds.

B. Birds died from eating the oil.

C. It was the worst oil spill of all the time.

D. Seals and whales were affected.

20. What is the main idea of the passage?

A. The worst oil spills in history.

B. The ocean life affected by oil spills.

C. How oil spills often occur.

D. The negative consequence of oil spills.

Questions 21 to 25 are based on the same passage or dialog.

Diamonds! Even the word seems to shine. Diamonds have been fascinating people for centuries. Ancient people believed the stones had magical powers. Kings and queens have worn them to display power and wealth. Brides-to-be have received them as tokens of love for at least 500 years. Luck, power, wealth, love — people have sought these and more in diamonds. The first diamonds were discovered in India more than 2,000 years ago. Because of their hardness, diamonds could not be polished as easily as other gems (宝石). Ancient Indian rulers wore the unpolished stones. Some Indians carried knives with edges and tips of diamond. Indians also use tools made with diamonds to cut hard materials. Centuries later, people discovered that diamonds — and only diamonds — can cut other diamonds. They began shaping and polishing the gems by rubbing one diamond against another. The flat surfaces that resulted made the diamonds more shining than other stones. Hand polishing was slow, difficult work which could cause injury rubbing the hard stones against one another. Later, a flat, revolving disk coated with diamond dust was used. It was turned by hand. Today a polisher uses a similar piece of equipment turned by a machine. A boy in what is now South Africa made one of the most important diamond discoveries of all time. One day in 1867, Erasmus Jacobs, 15, was resting beside a river when he saw a shining stone. He took the stone home, and his mother later gave it away. The stone turned out to be a diamond nearly as large as a golf ball. It was the first recorded discovery of a diamond in Africa. That find started a diamond rush, which continues to the present. Today South Africa is a major diamond supplier. Africa and Russia now are the sources of most of the world's diamonds. When most of us think of diamonds, we think of the expensive gems in rings and necklaces. Diamonds are valuable because they are rare and beautiful. To obtain an ounce of diamonds, miners must move many tons of rock. Then the diamonds are sorted by size, shape, color and clarity. Only one out of five rough diamonds is cut into a gem.

21. People first cut diamonds ________.

A. 2,000 years ago

B. centuries after diamonds were first discovered

C. in the 1800s

D. about 500 years ago