Today, many people put their personal and private information online (address, phone number, and credit card number) to facilitate everyday activities, such as banking, shopping, and socializing. Is this a positive or negative development?

More and more people no longer read newspaper or watch TV programs to get news. They get news about the world through the internet. Is this a positive or negative development?

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Being cautious about false information online

物理化学研究内容及对象 什么是物理化学? 从化学现象与物理现象的联系去寻找化学变化的规律性,即用物理的理论和实验方法来研究化学的一般

柏油马路起伏不止，马路像是贴在海浪上。我走在这条山区公路上，我像一条船。这年我十八岁，我下巴上那几根黄色的胡须迎风飘飘，那是第一批来这里定居

报告写作必备。

广州版六年级上册英语单词表

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3个视频。

大学物理C第七章

大学物理C第六章