There are a lot of overhead bridges in Sjye.aigapore.In the places where traffic is very heavy and crossing the road is not safe.These bridges can make people cross roads safely.Overhead bridges are used in very much the same way as zebra crossings.
   ①The overhead bridges are more useful，though people have to climb up a lot of steps.When people use an overhead bridge，they do not hold up traffic.But when they cross a busy road using a zebra crossing，traffic is held up.This is why the government has built many overhead bridges to help and keep traffic moving at the same time.
   The government of Singapore has spent a lot of money building these bridges.Some overhead bridges even have traffic lights on them.For their own safety，people should use them.Old people may find it a little difficult to climb up and down the steps，but it is still much safer than walking across the road with all the moving traffic.
   Overhead bridges are very useful.People，old and young，should always use them. ②这将有助于阻止交通事故的发生。

（1）请将文中①处句子译为汉语。

尽管人们必须爬很多台阶，但是天桥更有用。

尽管人们必须爬很多台阶，但是天桥更有用。

（2）请从文中找出与下面所给句子意思相同的句子。
If people use overhead bridges，they will do something good to the traffic.

When people use an overhead bridge，they do not hold up traffic.

When people use an overhead bridge，they do not hold up traffic.

（3）Why don't old people like using overhead bridges？

Because they may find it a little difficult to climb up and down the steps.

Because they may find it a little difficult to climb up and down the steps.

（4）请将文中②处句子译为英语。

This will help stop accidents from happening.

This will help stop accidents from happening.

（5）回答问题：
What does the underlined word "It" in the last sentence refer to （指的是）？

It refers to climb up and down the steps.

It refers to climb up and down the steps.