[求助]GWD中的两道题~~请各位帮忙解答一下~~

C.    administration, proposing mandatory restrictions on

D.    administration’s proposal was a call for mandatory restrictions, which include

E.     administration’s proposal would call for mandatory restrictions on 

GWD25-Q24~~这个题目是不明白原文有什么错误~~是therefore有问题么？

Although improved efficiency in converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting consumption.

A.   in converting harvested trees into wood products may reduce harvest
        rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting

B.    in converting harvested trees into wood products may reduce harvest
        rates, demand will be stimulated because of increasing supply and
        lowering prices, which boost

C.   of converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices,
        which boosts

D.   of harvested trees being converted into wood products may reduce
        harvest rates, it will stimulate demand, because it will increase supply
        and lower prices, thereby boosting

E.    when harvested trees are converted into wood products may reduce harvest rates, demand will be stimulated because of increasing supply
        and lowering prices, which boost

谢谢^^

In contrast to environmentalists
                proposals to limit emissions of certain
            pollutants, the administration proposed calling for mandatory restrictions of only three such
            pollutants from power plants-mercury, sulfur dioxide, and nitrogen oxides
            and the plan would delay such cuts until 2010 or later.
                

个人认为这句句子的写法就有问题：应该是在power后加一个冒号：

In contrast to environmentalists
                            proposals to limit emissions of certain
                        pollutants, the administration proposed calling for mandatory restrictions of only three such
                        pollutants from power： plants-mercury, sulfur dioxide, and nitrogen oxides
                        and the plan would delay such cuts until 2010 or later.
                            

个人认为这句句子的写法就有问题：应该是在power后加一个冒号：

In contrast to environmentalists
                proposals to limit emissions of certain
            pollutants, the administration proposed calling for mandatory restrictions of only three such
            pollutants from power： plants-mercury, sulfur dioxide, and nitrogen oxides
            and the plan would delay such cuts until 2010 or later.