Question

一个阅读理解的问题-----高手帮忙

London is the capital of theUnited Kingdom. It has about seven million people. The river Thames runs throughLondon.
People from all over the world visitLondonto seeBuckinghamPalace, the Houses of Parliament, Westminster Abbey and theTowerofLondon. There are many museums, theatres and parks inLondon, as well as offices and factories.Londonbegan as a Roman settlement called Londinium. The plague[pleig]（瘟疫）came to London in the 1600s, followed by the Great Fire of 1666. The city was badly bombed in World WarⅡ.
London is very slowly sinking into its foundations and the level of the River Thames is slowly rising. As a result, extra-high tides could flood a large part ofLondon. To prevent this happening, a great barrier（屏障）has been built across the Thames at Woolwich. If very high tides happen, the barrier can be raised andLondonwill be safe.

50、The reason why a great barrier has been built across the Thames at Woolwich is that .
A：London is very slowly sinking into its foundations
B：the level of the river Thames is slowly rising
C：extra-high tides could flood a large part of London
D：all of the above
【问题1】“题目The reason why a great barrier has been built across the Thames at Woolwich is that ”看不懂，请解释。
【问题2】选项页看不懂，请解释。

Answer 1

伦敦千亿王国的首都。它有大约700万人。泰晤士河运行throughLondon的
人们从所有，世界各地visitLondonto seeBuckinghamPalace，议会，西敏寺和theTowerofLondon的两院。有众多的博物馆，剧院和公园INLONDON，以及办公室和作为一个罗马factories.Londonbegan叫伦迪尼乌姆的结算。瘟疫[pleig]（瘟疫）来到伦敦，在17世纪，其次是1666年的大火灾。城市遭到严重轰炸在第二次世界大战Ⅱ
伦敦非常缓慢下沉到其基础和泰晤士河的水平缓慢上升。因此，额外的高潮可能会涌向很大一部分ofLondon。为了防止这种情况发生，一个伟大的屏障（屏障）已建成横跨泰晤士河在Woolwich。如果发生非常高的潮汐，屏障可以提高andLondonwill是安全的。50，是一个很大的障碍的原因，已建成横跨泰晤士河在Woolwich 答：伦敦是非常缓慢地沉入其基础乙的水平泰晤士河缓缓升起C：额外的高潮可能会涌向了很大一部分的伦敦D：

Answer 2

The reason why a great barrier has been built across the Thames at Woolwich is that

这是一个复合句
the reason是主语
is是谓语
that引导宾语从句
why a great barrier has been built across the Thames at Woolwich修饰reason是定语从句
其中across the Thames at Woolwich是一个地点状语修饰barrier
has been built是被动语态，主语是barrier

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