[填空题]

Blasts from the Past

1 Volcanoes were destructive in ancient history. Not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease.
2 Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large number of animals, but all the mass extinction cover the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do.
3 Wignall calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.
4 The Permian extinction, for example, which happened 250 milli

[填空题]

Blasts from the Past

1 Volcanoes were destructive in ancient history. Not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease.
2 Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large number of animals, but all the mass extinction cover the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do.
3 Wignall calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.
4 The Permian extinction, for example, which happened 250 milli

[填空题]
1 Volcanoes were more destructive in ancient history. Not because they were bigger, but because the carbon they released wiped out life with greater ease.
2 Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do.
3 Wignall calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size for size, older ruptions were at least 10 times as effective at wiping out life as their more recent rivals.
4 The Permian extinction, for example, which happened 250 million years ago, i

[填空题]Cattle imported from Britain were considered especially likely to have mad cow disease, according to the Canadian Ministry of Agriculture.

[单项选择]
His people said good-bye and watched him walk off toward the mountains. They had little reason to fear for his safety: the man was well dressed in insulated clothing and equipped with tools needed to survive the Alpine climate. However, as weeks passed without his return, they must have grown worried, then anxious, and finally resigned. After many years everyone who knew him had died, and a note even a memory of the man remained.
Then, on an improbably distant day, he came down from the mountain. Things had changed a bit: it wasn’t the Bronze Age anymore, and he was a celebrity.
When a melting glacier released its hold on a 4,000-year-old corpse in September, it was quite rightly called one of the most important archeological finds of the century. Discovered by a German couple hiking at 10,500 feet in the Italian Tyrol near the Austrian border, the partially freeze-drie
A. tell the readers a true story about the Ice Man and his family
B. tell the readers about the cause of the Ice Man’s death
C. provide some information about the life 4,000 years ago
D. introduce some background to the Ice Man in a vivid way