【C13】A．uniqueB．oddC．smallD．rare

【C18】A．illegalB．oddC．vainD．wrong

A．particularlyB．essentiallyC．obviouslyD．rarely

The custom is ____ to the region.A.uniqueB.strangeC.rareD.peculiar

These flowers are very____ in this country.A.uniqueB.strangeC.rareD.peculiar

【C9】A．costlyB．cheapC．smallD．noisy

为了使索引键的值在基本表中唯一 在建立索引语句中应使用保留字（)A UNIQUEB COUNTC