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问题 单项选择题

某交易不动产的土地使用面积为200m2，成交总价100万元人民币，使用面积占建筑面积的比率为75%，则该交易实例的单位建筑面积价格为( )元。

A．3750
B．4000
C．5000
D．5333

答案

参考答案：A

填空题
从方框中选择正确的单词填空，使短文连贯完整。
often, hospital, do, some, times,or, running, late, questions, healthy
       My friend, Julia, didn't feel well this morning,so my classmates and I took her to the    1   The
doctor examined(检查)her and asked her some   2  .Then the doctor said she was not very    3  .The
doctor gave her some medicine andasked her to take it three  4  a day. And the doctor gave her   5   
suggestions,  too.  Shecan't watch TV   6   play computer games too much. She needs to exercise   7  .  
She can't go to bed too   8   .She needs to get up early and   9   some sports every day, like    10   and
walking. These can help her to keep in good health.
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填空题

（8分）肉桂醛是一种食用香精，它广泛用于牙膏、洗涤剂、糖果以及调味品中。

工业上可通过下列反应制备：

（1）请推测B侧链上可能发生反应的类型：                  （任填两种）

（2）请写出两分子乙醛在上述条件下反应的化学方程式：                       

（3）请写出同时满足括号内条件下的所有同分异构体的结构简式：

（①分子中不含羰基和羟基②是苯的对二取代物③除苯环外，不含其他环状结构。） 

                                                                      
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