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选材规范、标准演练;循序渐进、梯度提升;题量丰富、有效提高;技巧同步、一语中的;缩略速记，全面覆盖。 注意直接听写正文 Cell phones are an unavoidable part of daily life. Even if you do not own one yourself, you are exposed to them all the time whenever you enter the public areas. Most people think of their cell phones as something that they just could not live without. Make sure you are informed about the potential health hazards associated with cell phone use that the cell phone companies do not want you to know. While studies are not conclusive, scientists are beginning to suspect that cell phone use could contribute to everything from headache to brain cancer. This is because cell phones emit electromagnetic waves and small amounts of radiation. While research done in the 1990s indicated that the radiation using a cell phone could expose you to is not really enough to do any damage, many experts are now abolishing that opinion. They recommend that, at the very least, children, teens and young adults avoid using cell phones except in emergencies. | 
