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TF阅读真题第748篇The Origin of the K-T Asteroid
It is now generally accepted that dinosaurs (and large numbers of other animals and plants) went extinct about 65 million years ago, when Earth was hit by a giant asteroid (a rocky...
TF阅读真题第812篇The Roman Aqueduct System
The Roman Aqueduct System Around 300 ʙ.ᴄ.ᴇ., the population of the city of Rome reached half a million and required a solution for its growing water needs...
TF阅读真题第883篇The Azolla Event
The Azolla Event During the early Eocene period, about 56 million years ago, Earth's atmosphere had high levels of carbon dioxide(CO2) which warmed the planet. But a...
TF阅读真题第920篇Animal Migration Patterns in the Serengeti
Animal Migration Patterns in the Serengeti The Serengeti, a region in northern Tanzania, is the site of the largest mammal migration on Earth. Herds of wildebeest, zebras...
TF阅读真题第949篇Is Panspermia Possible
Is Panspermia Possible 题目： In 1996,NASA scientists claimed that Allan Hills 84001 (abbreviated ALH 84001),a meteorite containing materials ejected from Mars 15 million ...
TF阅读真题第728篇Europe’s Economic Recovery in the Fifteenth Century
TF阅读真题第728篇Europe's Economic Recovery in the Fifteenth Century
