As a result, the population of the world is increasing, causing tots of problems. Second, because of the development of industry, tots of the wastes from factories pour into the air and rivers, causing pollution of att kinds. Third, some terrorists are using science and technology against mankind. They use biological, chemical and unclear weapons to threaten world peace...
So its urgent that we find ways to solve these problems. But we should not stop the development of science and technology because of these disasters they bring, just as we should not give up eating for fear of choking. In addition, we should make some rules to regulate our actions. As long as we use science and technology in a proper way, they may bring us even more benefits.
人教PEP版英语三下《Unit 4 Do you like candy?》Lesson 22(4) PPT课件
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人教PEP版英语三下《Unit 3 How Many?》PPT课件之八
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人教PEP版英语三下《Unit 4 Do you like pears》PPT课件之十
人教PEP版英语三下《Unit 3 How Many?》PPT课件之六
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人教PEP版英语三下《Unit 4 Do you like pears》PPT课件之九
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人教PEP版英语三下《Unit 2 My family》PPT课件之七
人教PEP版英语三下《字母ABC 1》PPT课件
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人教PEP版英语三下《Unit 4 Do you like pears》PPT课件之十八
人教PEP版英语三下《Unit 4 Do you like pears》PPT课件之十三
人教PEP版英语三下《Unit 3 How Many?》PPT课件之四
人教PEP版英语三下《Unit 3 How Many?》PPT课件之五
人教PEP版英语三下《Unit 2 My family》PPT课件之四
人教PEP版英语三下《Unit 4 Do you like pears》PPT课件之十五
人教PEP版英语三下《Unit 1 Welcome back to school》PPT课件之五
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人教PEP版英语三下《Unit 2 My family》PPT课件之六