读等温线及地质剖面图，回答问题。

小题1:该处的地形及地质构造是（  ）

A．山地、背斜

B．山地、向斜

C．盆地、向斜

D．盆地、背斜小题2:该岩层沉积的先后顺序及岩层的新老关系是（  ）

A．中心岩层新，两边岩层老

B．两边先沉积，中心后沉积

C．上部岩层老，先沉积，下部岩层新，后沉积

D．下部后沉积，上部先沉积

Believe it or not，optical illusion can cut highway crashes.
Japan is a case in point．It has reduced automobile crashes on some roads by Rearly 75 percent using a simple optical illusion．Butst．ripes,called chevrons(人字形)，painted on ther rads make drivers think that they are driving faster than they really are，and thus drivers slow down.
Now the American Automobile Association Foundation for Traffic Safety in Washington D．C. is planning t。repeat Japan’s success．Starting next year，the foundati。n will paint cheyrons and。ther pattems of stripes on selected roads around the country to test how well the patterns reduce highway erashes．
Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents， according to the foundation．To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves，exit slopes，traffic circles，and bridges．
Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half．However,traffic。ften returns to full speed within months as driVers become used to seeing the painted bars．
Chevrons，scientists say，not only give drivers the impression that they are driving faster than they reallv are but als0 make a lane appear to be narrower．The result is a longer lasting reduction in highway speed and the number of traffic accidents．

The advantage of chevrons over straight, horizontal bars is that the former______.

A. can keep drivers awake

B. can cut road accidents in half
C. will look more attractive

D. will have a longer effect on drivers