[单项选择] In an event known as the "Great Dying", some 250 million years ago, 90 percent of all marine life and nearly three-quarters of land-based plants and animals went extinct. Scientists have long debated the cause of this calamity--which occurred before the era of dinosaurs--with possibilities including such disasters as meteor impacts. Researchers led by Peter Ward of the University of Washington now think the answer is global warming caused by volcanic activity. Their findings are ’’reported in Thursday’’s online edition of the journal Science. They studied the Karoo Basin of South Africa, using chemical, biological and other evidence to relate layers of sediment there to similar layers in China that previous research has tied to the marine extinction at the same period. Studying a 1,000-foot thick section of exposed sediment, Ward’’s team found evidence of a gradual extinction over about 10 million years followed by a sharp increase in extinction rate that lasted another 5 mi
A. was unique in evolution
B. evolved out of the low-oxygen environment hundreds of million years ago
C. is hard to explain
D. caused their extinction

[单项选择] In an event known as the "Great Dying", some 250 million years ago, 90 percent of all marine life and nearly three-quarters of land-based plants and animals went extinct. Scientists have long debated the cause of this calamity--which occurred before the era of dinosaurs--with possibilities including such disasters as meteor impacts. Researchers led by Peter Ward of the University of Washington now think the answer is global warming caused by volcanic activity. Their findings are ’’reported in Thursday’’s online edition of the journal Science. They studied the Karoo Basin of South Africa, using chemical, biological and other evidence to relate layers of sediment there to similar layers in China that previous research has tied to the marine extinction at the same period. Studying a 1,000-foot thick section of exposed sediment, Ward’’s team found evidence of a gradual extinction over about 10 million years followed by a sharp increase in extinction rate that lasted another 5 mi
A. 90% of animals and plants went extinct 250 million years ago
B. dinosaurs died off as a result of meteor impacts
C. the "Great Dying" has much to do with volcanic activity
D. global warming played a minor part in the "Great Dying"

[填空题]Having made this event known to the public, the reporter __________(已经从妇演员的窘境中捞到了好处).

[填空题]In Night Watch, the son whose hand the dying old man held tightly was ____.

[填空题]There are some great differences between a traditional family and a modern one. The first important difference is in the (11) . In the past, the husband was the only one who worked outside the home. And it was the husband who usually made decisions about (12) . But now the husband is not the only one who may do so. The (13) is in the woman’s role. In the past, a woman worked until she had children. But now she works outside the home even when she has children. (14) , she is busier. The final difference is in the role of the children. In the past, children were mostly (15) by their mother. But now children have to get up early and get ready for school themselves and some of’ them may even have to make breakfast themselves.