Prep有几题请大家帮忙看看

1、Some patients who do not respond to therepies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage two low to be effective or having been taken off a drug too soon.

这个是正确答案，但是为什么take off是被动呢？病人吃药应该是主动的啊

2、According to one expert, the cause of genetic irregularities in many breeds of dogs is not so much that dogs are being bred for looks or to meet other narrow criteria as that the breeds have relatively few founding members.

哪位能分析下语法结构么？一点都没看懂

3、还有一个逻辑题中的一句话，是倒装，不知道到底什么意思：

but the prediction would not have adversely affect the dollar had it not been for goverment deficit, which must therefore decrease to prevent future declines.

4、The number of plant and animal species that human are known to have forced to extinction in the last millennium is over 800.

划线部分是否有省略？