皮皮学，免费搜题
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搜题
【单选题】
使胃蛋白酶原转变为胃蛋白酶的激活物是A.
钠离子
B.
氯离子
C.
钾离子
D.
盐酸
E.
内因子
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皮皮学刷刷变学霸
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【单选题】_____ number of people have bought the newly album of Richard Marks,but I didn ’ t know _____ exact number of them.
A.
The,a
B.
A,the
C.
The,the
D.
A,an
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