2. 外语
  3. A、It still requires further improvement. B、It is a little complex to charge a cell phone with the material. C、It can produce the

A、It still requires further improvement. B、It is a little complex to charge a cell phone with the material. C、It can produce the

admin2022-11-28  16
问题
选项 A、It still requires further improvement.
B、It is a little complex to charge a cell phone with the material.
C、It can produce the power needed by an iPhone.
D、It is a little expensive to manufacture this material.
答案A
解析 短文中间部分介绍，这种材料只能产生140毫微瓦的电量，也就是一个苹果手机待机时所需电量的百万分之一，但是科学家在进一步研究，希望提升这一材料的质量。由此可知，这一材料的质量有待提升。
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大学英语四级

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