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问题 单项选择题

空间数据对事物最基本的表示方法是点、线、面和三维表面。其所谓面是该事物具有封闭的边界、确定的面积，一般为不规则的多边形，下列属于方法举例的是（）。

A.环保监测站

B.道路

C.不规则的地形表面

D.行政区域

答案

参考答案：D

选择题
people who often stay up too late are more likely to die of heart disease, ___________a study.
A. with the help of
B. because of
C. according to
D. as a result.
 
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选择题

After a second thought, Bill ________ a better idea of how to solve the problem.

A．put up with

B．kept up with

C．came up with

D．mixed up with
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