Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck" -at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
97. Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation. (A) at some time in the past our ancestors suffered an event, greatly reducing their numbers (B) that at some time in the past our ancestors suffered an event that greatly reduced their numbers (C) that some time in the past our ancestors suffered an event so that their numbers were greatly reduced, (D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced (E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, 答案选c 选项a中有句解释不太理解 The structure makes that clause appera to be an awkward and rhetorically puzzling suparate assertion that the writer has appended to the prior claim about what the anthropologists believe. The agent or cause of reducing is unclear. 求大牛小牛们指点~~谢谢~~
3. OG官方解释为'The agent or cause of reducing is unclear.'
意思是reducing修饰的对象不清,或说reducing的原因不清。
也可以理解为reduce'造成歧义'或'语义模糊/逻辑不清'。
选项A中 at some time... 是独立完整句子有主谓宾。
此处保留精华后句子为Ancestors suffered an event, reducing X.
主语谓语都是名词,而且对于reduce这个动作都是主动(没有哪个是被动,有被动可以排除reduce修饰它,所以只可能修饰另一个)。所以句中同时出现的两个名词都可能是reducing修饰的对象,
可能是Ancestors主动reduce their numbers
也可能是the event去reduce ancestors’ numbers。
默认看的人是不懂这句话的意思的,需要通过正确的语序才看懂句意,所以此处不可以用reducing,因为可能导致某些无知的人类,以为此句意思是:人类祖先自己要reduce自己的数量,这样就会如官方答案说的"unclear agent or cause"
MAXFIN 发表于 2016-9-9 11:41
其实我更纠结的是 a 的that为什么必须有,翻了一下曼哈顿对dash用法的解释:
The dash (-) is a flexible p ...
谢谢分享! 这里的 破折号,就像曼哈顿里面写的: you can use the dash to restate or explain an earlier part of the sentence. 其实就是 “换句话说” 的意思,所以后面的句子要加that 。 这一点跟OG 里面的解释也是一致的。