题目

The house built of stone lasts longer than ____ built of wood.    A. the one B. one C. that D. its 答案:C 解析: 不定冠词 a 限定名词时,下文one用来代替;而定冠词the限定名词时,下文that用来代替某22肽被水解成1个4肽,2个3肽,2个6肽,则这些短肽的氨基总数的最小值及肽键总数依次是(  )                                A.6  18      B.5  18       C.5  17        D.6  17
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