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TF阅读真题第770篇Economic Reasoning
Economics begins with the assumption that human actions are rational-intended for maximum self-benefit. For example, people pay more for a larger box of the same cer...
TF阅读真题第742篇Measuring Climate Change on Mountains
Climate change has been linked to greenhouse gases in Earth's atmosphere that allow sunlight to reach the planet's surface while trapping the infrared energy that it emits...
TF阅读真题第797篇The Australlan Megatauna Extinctions
The Australlan Megatauna Extinctions Many of the species of large animals(megafauna) such as mammoths, mastodons, ground sloths, and giant deer that roamed the Earth tens of thous...
