正确答案: ABC

激活胃蛋白酶原 为胃蛋白酶提供酸性环境 杀死食物中的细菌

题目：胃酸的作用有（　　）

解析：略

查看原题 查看所有试题

学习资料的答案和解析：

[单选题]《饮酒》是一首

乐府诗

[单选题]中国革命和建设的基本立足点是

独立自主

[单选题]坚持与时俱进，最重要的是

要使党的全部理论和工作富于创造性

[单选题]__________

根据以下内容，回答下面的题目。The death of a child, _51_ one’s own child,is something the mind can hardly comprehend．It seems togo _52_ nature．The end of a life that is still forming_53_ has just begun is an almost unthinkable cruelty．But it happens．Parents sometimes must witness the illness and death of the children_54_ whom they gave birth．And _55_ will ever fill theempty place that the dead child leaves behind．Parents_56_ to die before their children, which is the natural order of life events．When the situation is reversed and a child dies _57_ the parents itseems wrong．Yet we never know why one person dies andanother lives．But we do know _58_ a child is gone, theparents still have a future, as grey and worthless as it may at first seem．Death may take the child, but the love never _59_．The sorrow after a child’s death is one ofthe longest and hardest type of _60_ to live with．And ittakes long to deal with the parents’ own emotions．__________

or

[单选题]《谏逐客书》的中心论点是（　　）

逐客错误

解析：【答案】B 【解题思路与技巧】 《谏逐客书》的中心论点是“臣闻吏议逐客，窃以为过矣”。事斯首先以史为证.列举秦国历史上四位明君任用客卿使秦国富强的事实;再将逐客与享用异国色乐珠玉对比，指出重物轻人非成就帝业之术;并分析逐客的危害.从而论证“非秦者去，为客者逐”的错误。因此选择B项。

[单选题]下列关于债权的说法，不正确的是 （　　）

债权具有排他性

[多选题]下列能排酸保碱，维持机体酸碱平衡的有（　　）

H+的分泌

NH3的分泌

H+一Na+交换

[单选题]关于铁吸收的错误叙述是 （　　）

与内因子有关