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There are 400 million mobile phones in use globally with another 250,000 new users added every day.

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Part II WritingDirections: Write an essay on the following topic. The topic has an outline you can followTopic:Benefits of Credit Card1. Introduction:More and more people use credit cards2. Benefits of using credit cards1) make it easier to buy things2) offer us additional protection3) be useful in times of emergency.3. Conclusion

世界上第一种合成纤维,被命名为。

A. 尼龙
B. 硝化纤维
C. 赛璐璐
D. 电木

高分子长链是由很多小分子有机化合物聚合而成 ——高分子材料也称为聚合物材料。

A. 对
B. 错

由于合成纤维的出现,可以把棉田解放出来种植粮食了。

A. 对
B. 错

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