2014考研英语阅读经典试题及答案(20)_大学英语阅读

　　3. According to the text, the defining characteristic of an electride is which of the following?

　　[A] Its positive are of particularly low mass.

　　[B] Its ions possess identical electrical charges.

　　[C] It contains a framework of regularly stacked ions.

　　[D] Its negative ions consist solely of electrons.

　　4. It can be inferred from the text that anions behaving as simple charged spheres could be expected to

　　[A] readily lose electrons and become positively charged.

　　[B] move freely in and out of their cavities.

　　[C] respond to photons by liberating electrons.

　　[D] remain fixed relative to their cations.

　　5. With which of the following statements regarding electrides would the author most likely agree?

　　[A] They have proven themselves to be of great commercial value.

　　[B] Their future commercial value is promising but uncertain.

　　[C] They are interesting but of no practical value.

　　[D] They have commercial value mainly in solar energy applications.

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