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.

有一份答案选B，个人倾向于选A，另外也有一份答案选A。

Support A！

B ： 1）被动 不 perfer.

    2) Because of 没有 by doing 好。

    3）which 指代有歧义。

i choose B

A选项中的it,指代不明，是前面整个句子，还是之前的“rates"?而B中的demand更适合

做主语

it应该不能指代rates吧,我觉得根据主从句主语一致的原则，it应该就是指

improved efficiency。另外根据就近原则which应该指代lowering prices，但从句的

意思应该是lowering prices 刺激了demand，进而推动了消费，如果选B是不是就无法

体现出这一递进关系呢？一家之言，还望大家指正。