t can be inferred from the passage
that an electride behaves most like a
normal ionic crystal when the electride
has which of the following features?
The anionic cavities are widely
separated.
All of the trapped electrons are
able to delocalize.
The trapped electrons are liberated
by impinging photons.
The ions are tightly packed together.
Most of the cations have lost their
electrical charge.

————————————————————————
答案：(A)
　　在各种最简单和最为人熟知的晶体中，离子盐即是其中之一，其典型的实例就
是氯化钠，或普通佐餐食盐。离子盐的基本成分是离子：那些由于获得或失去了一
个或多个电子而变成带有电荷的原子或分子。例如，在形成氯化钠的过程中，同原