Q16: Humans have been damaging the environment for centuries by overcutting trees and farming too intensively, and though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis.
A. though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population
B. though some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago, great increases in population
C. though some protective measures, such as establishing national forests and wildlife sanctuaries having been taken decades ago, great population increases
D. with some protective measures, like establishing national forests and wildlife sanctuaries that were taken decades ago, great increases in population
E. with some protective measures, such as the establishment of national forests and
wildlife sanctuaries, having been taken decades ago, great population increases Answer:
答案是C，相比下也没有别的了。但是我的疑问是C的结构是句子1 （Humans have been damaging the environment for centuries by overcutting trees and farming too intensively） ，and though 句子2（and though some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago），句子3(great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis. )；那句子2和句子3之间的连词呢？
唯一的解释是and though中的though做连词（though也可以做副词）来连接句子2和句子3，and 用来连接句子1和句子2。 但是2个连词一起使用我还没有见过。还是我的这套分析有误，应该是别的解释！希望大家解释一下喽。
the answer is B.
C great population increases and in the intensity of industrialization are ????
不好意思，打错字，我问的就是答案B的问题！
答案是B，相比下也没有别的了。但是我的疑问是B的结构是句子1 （Humans have been damaging the environment for centuries by overcutting trees and farming too intensively） ，and though 句子2（and though some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago），句子3(great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis. )；那句子2和句子3之间的连词呢？
唯一的解释是and though中的though做连词（though也可以做副词）来连接句子2和句子3，and 用来连接句子1和句子2。 但是2个连词一起使用我还没有见过。还是我的这套分析有误，应该是别的解释！希望大家解释一下喽。
自己再顶一下喽！
不好意思，打错字，我问的就是答案B的问题！
答案是B，相比下也没有别的了。但是我的疑问是B的结构是句子1 （Humans have been damaging the environment for centuries by overcutting trees and farming too intensively） ，and though 句子2（and though some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago），句子3(great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis. )；那句子2和句子3之间的连词呢？though
唯一的解释是and though中的though做连词（though也可以做副词）来连接句子2和句子3，and 用来连接句子1和句子2。 但是2个连词一起使用我还没有见过。还是我的这套分析有误，应该是别的解释！希望大家解释一下喽。
句子1 and 句子3 --
though 句子2 is used to introduce the main statement 句子3
谢谢楼上！
你的意思是：句子1，and (though 句子2，句子3)。 我也是怎么理解的，就是看着and though有点不舒服，2个连词在一起！
谢谢楼上！
你的意思是：句子1，and (though 句子2，句子3)。 我也是怎么理解的，就是看着and though有点不舒服，2个连词在一起！
yes
補充依點
A and D are out because such as > like
B's and E's "having been taken decades ago" are ambivious modifier
在一个句子当中,举例的时候一般用SUCH AS而不用LIKE
本题结构:句子1,and (though引导让步状语从句,主句)----句子2
does it make sense?
谢谢2位的解释，彻底明白！
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=121448&replyID=&skin=0
这个讲得很清楚
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