单项选择题

Why did the city uncovered look almost the same as it had looked in AD 79()

A. Because Ginceppe and his men dug it slowly and carefully.
B. Because the city was buried alive and remained untouched.
C. Because scientists successfully rebuilt the city with everyday objects.
D. Because nobody had lived in the city ever since the volcano erupted.

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单项选择题

Under what conditions will the formation of cancer begin()

A. When a chromosome breaks apart neat an oncogene and its control functions fail.
B. When people drink too much and are easy to get tired.
C. When people smoke too much and are difficult to get to sleep.
D. When people eat too much petroleum-based products.

单项选择题

Logging was greatly reduced ()

A. in the northeastern United States
B. on seven million acres of public land
C. two decades ago
D. to save the barred owls