了解托福阅读文章的一些背景知识，对于提高托福阅读做题准确率，拓展知识储备都很有好处，为大家带来托福阅读背景知识，希望对大家有所帮助。 Lava is magma that breaks the surface and erupts from a volcano. If the magma is very fluid, it flows rapidly down the volcano’s slopes. Lava that is more sticky and less flu...