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.
[答案与考点解析]
1. 【答案】B
【考点解析】本题是一道中心主旨题。本文的中心主旨句在第二段的第一句,如果抓住了这句话并且联系每段的中心主旨句,就可得出本题的正确选项B。其实本文第二段就是在讲一种新的晶体的与众不同的characteristics(特点)。考生在解题时一定要首先找出全文的中心主旨句,并与上下文联系。
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