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问题 选择题

将Na2O2逐渐加入到含有Al3+、Mg2+、NH4+的混合溶液中并加热，产生沉淀和气体的物质的量与加入Na2O2的物质的量的关系如下图所示．则原溶液中Al3+、Mg2+、NH4+的物质的量分别为（　　）

A．2mol、3mol、8mol

B．3mol、2mol、8mol

C．2mol、3mol、4mol

D．3mol、2mol、4mol

答案

答案：C

完形填空

76．_____________________________ (为了不辜负父母的期望), she buried herself in her studies day and night, anxious to be admitted to her dream university. (live)

77．_____________________________ (还没适应) life here, he felt completely out of place among the local people. (accustomed)

78．He hurried into the lecture hall, ____________________________ (报告厅前面坐着一位教授) who was giving a talk to the students. (front)

79．With the city library providing large quantities of books, the children here have access to _____________________________ (任何值得一读的东西). (worthy)

80．The police found very few clues on the spot where the murder occurred. All the evidence _____________________________ (很有可能被销毁). (may)
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单项选择题

鼻窦黏膜下囊肿描述，正确的是（）

A.临床多有症状

B.一个窦腔多发

C.额窦、筛窦多见

D.基底位于上颌窦的窦底或外侧壁的类圆形软组织肿块

E.增强明显
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