The Nile River Valley Though the verdant green course of the Nile Valley appears to be the very antithesis of the bleached Saharan sands through which it flows, these two contras...

TF阅读真题第834篇Group living

Why Did Agriculture Arise   Sometime around 10,000 years ago, some hunter-gatherers took up agriculture. Though the advantages may seem obvious, there are also disadvantages: ...

Mycorrhizae     Fungi are organisms, including mushrooms, yeasts, and molds, that absorb and decompose organic material. Most land plants have specialized roots that con...

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TF阅读真题第799篇Surviving as a Conifer

Food Caching by Scrub Jays     The western scrub jay is a highly intelligent bird, and biologists have conducted a number of experiments on its cognitive abilities base...

TF阅读真题第854篇Why Did Social stratification Emerge

    综合写作：   Reading： The black robin is a small bird native to the islands of New Zealand. Several decades ago, black robins almost died out. Although the fu...

TF阅读真题第814篇Agriculture in Colonial New England