问题
选择题
278. The road constant improvements can’t keep pace with the increasing ____ .
A．trucks
B．private cars
C．buses
D．Traffic
答案
D
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278. The road constant improvements can’t keep pace with the increasing ____ .
A．trucks
B．private cars
C．buses
D．Traffic
D
cm，那么，在圆柱体的表面，从A点到D点的最短距离为()。
