答案:
1-5 ADCCB
1.选A justified做“有根据的，正确的”If the subject matter is justified,and the city is threatened with a likely flood.所以unjustified就是"没有根据的,没有必要的"
2.选D ①flush with齐平，同高These cupboards are flush with the wall. ②parallel to 平行，类似My feelings in this matter are parallel to yours. ③level in同等，获同样成功The two girls are just about level in mathematics. ④flat 平坦的，一般不与介词on搭配The surface of most tables is flat.
3.选C ratio表两者之间的“比率或比例”常月to搭配The ratio of 10 to 5 is 2 to 1.
4.选C 此处and连接的应该是和第一个done并列的过去分词。
5.选B be reduced to doing sth不得不做某事He was reduced to begging in the streets./He was reduced to despair./ Its people were thus reduced to slavery