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TF阅读真题第909篇The History and Composition of Laundry Detergent
The History and Composition of Laundry Detergent The earliest ancient people used plain water for cleaning. Water can dissolve different kinds of substances and then...
TF阅读真题第889篇The Moon’s Origin
The Moon's Origin One of the earliest scientific theories about the Moon's origin postulated that Earth and its moon formed out of a dust cloud alongside one another, much a...
TF阅读真题第926篇Sunspot Cycles
Sunspot Cycles Dark regions on the Sun, called sunspots, were studied in 1610 by Galileo, who turned the newly invented telescope on objects in the sky. A lively deba...
25.4.26托福写作范文+分析
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878篇Sensory Ecology
Sensory Ecology Some of the most important sensory information animals have to process comes from other animals. Interactions between predators and prey, pare...
TF阅读真题第896篇Early Food Production in Africa
Early Food Production in Africa Farming appeared in Africa by 5000 B.c.E. Eventually, several different styles of food production developed. These variations were caused by ...
