1.Perhaps the most significant postwar trend was the decentralization of cities thoughout the US,_____when massive highway-building programs permitted greater suburban growth.

A,and accelerated a phenomenon . B , a phenomenon that accelerated

偶选Ａ可是答案是B,B在句中是啥成分阿？？

2.Ronald Reagan had served two terms as governor of California before____President.

A,he became B,became

before后面到底加什莫？可以加句子吗？句子的主语可以省吗？

3。Because of __________diversity,seven separate groupings or divisions of algae have been established by botanists.

A,their B,those

为啥those不行啊？应该后者更好啊，前面又没有提范围？

4。Because Mars is farther from the Sun than____,Mars takes longer to complete a revolution

A.Earth is B.is from Earth. C,what is Earth D, is it Earth

不是than后要到装吗，咋不到装选第一个拉阿c为啥也不对阿

谢谢啦…

1.“同位语”，解释说明the decentralization of cities thoughout the US

2. 加句子，要省略一般是系表结构，且主语一致。

3.代词就是用来指代的，their指代seven separate groupings or divisions of algae

those用来泛指，大家有什么别的解释？来说说。

4 不是than后要到装吗，倒不倒装无所谓

咋不到装选第一个拉阿c为啥也不对阿 选其他的选项than前后比较成分不对称

这道题目解析过，我记得。参见“比较三原则”。