中考完形填空
阅读下面短文，掌握其大意，然后从各题所给的A、B、C或者D 四个选项中选出最佳选项。
Overhead bridges can be seen in many parts of Singapore, in the place where traffic is very heavy and crossing the road is 1 .
These bridges can make people 2 roads safely. Overhead bridges are used in very much the same way as zebra crossings.
They are more efficient (效率高的), 3 less convenient (方便的) because people have to climb up a lot of steps. This is inconvenient to the old. When people 4 an overhead bridge, they do not hold up (阻挡) traffic. But when they cross a 5 road using a zebra crossing, traffic is held up. This is 6 the government (政府) has 7 many overhead bridges to help people and 8 traffic moving at the same time.
