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TF阅读真题第832篇Canals and Railroads in the Early 19th
TF阅读真题第832篇Canals and Railroads in the Early 19th
TF阅读真题第852篇Noise in the Sea
Noise in the Sea Sound is one of the most important means of communication for creatures underwater. In the clear water of a coral reef you can see up to 200 feet at most. I...
TF阅读真题第887篇Why Did Agriculture Arise
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: ...
TF阅读真题第910篇Agricultural Origins
Agricultural Origins It is tempting to think that people started domesticating plants and animals because hunting and gathering was laborious and then someone had the brilli...
TF阅读真题第919篇Building Materials in the Nineteenth Century
Building Materials in the Nineteenth Century For most of the nineteenth century, European architects built in historical revival styles (styles that imitate ...
TF阅读真题第921篇The Greenhouse Effect on Venus
The Greenhouse Effect on Venus The nitrogen and oxygen gases that make up the bulk of Earth's atmosphere neither absorb nor emit thermal radiation, energy that is released f...
TF阅读真题第895篇Parental Care by Frogs
Parental Care by Frogs Only an estimated 10 percent of anuran (frog and toad) species provide any kind of parental care. But within this 10 percent there is very great diversity ...
