15.　 D。 你会对它们了解得更多。

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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.

The government of Singapore has 　9　 　a lot of money building these bridges. For their own safety, people should be given hope to use them 　10　 　rushing across the road. Old people may find it a little 　11　 　climbing up and down the steps, but it is still much safer than walking across the road 　12　 　all the moving traffic.

Overhead bridges are very useful. People, 　13　 　old and young, should 　14　 　use them. This will stop accidents 　15　 　happening.

14.　 D。 尽管它们不是元素，但他们是人类环境的三个主要部分。

13.　 C。 无论是语法结构还是意思只有In fact对。

12.　 D。 either用于否定句，“也不”的意思。

11.　 B。最终得出结论。另外三个选择都很显然不对。

10.　 C。此处decided意为“得出结论”。believe很具有迷惑性，但其时态不对。特别要当心呀。

9.　　　 C。这里的as有“随着”的意思，相当于when 。

8.　　　 A。他们“称之为……”told , said 都不准确，而name的时态不对。

7.　　　 B。人们误以为，事实并非如此。

6.　　　 A。与下文中above的意思相反，即在地表之下。