求大神解答！！dated at 和dated to be什么区别啊？

huangyu1648

之前在OG也遇见过，今天看prep又见一个，跪谢了亲们~例如此题：Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.
A.    has been dated to be 3.47 billion years old and thus is
B.    has been dated at 3.47 billion years old and thus
C.    have been dated to be 3.47 billion years old and thus are
D.    have been dated as being 3.47 billion years old and thus      
E.    have been dated at 3.47 billion years old and thus are

dingzhiyu

prep08语法笔记：

1. date to/at区分
1) date….to  可追溯sth到...几年，强调发生的时间点，后面是ago
2) date….at  年代判定、鉴别/年份有….年之久，强调发生到现在经过的时间有多长，后面是old

2. 注意date to 后面是ago，而date at 后面是old。
date…..to可追溯sth到...几年，强调发生的时间点
P1-129    The teeth and jawbones found in Tanzania by Dr. Mary Leakey anddating to3.75 million years ago are the oldest reliably dated human fossils.

G21-34    Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of adry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date at which humans are known to have made stone tools.

date….at年代判定、鉴别/ 年份有….年之久，强调发生到现在经过的时间有多长

G31-28    Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.

G13-28    Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands.

3.  另外date在OG 之可见用法如下：
date back: have its origin
date from: to reckon from some point in time

Native American burial sites dating back 5,000 years indicate that the residents of Maine at that time were part of a widespread culture of Algonquian-speaking people．
一个5000年前的北美遗址指出在那时期的缅因州居民是广大的Algonquian-speaking people文化的一部份  

The concept of the grand jury dates from the twelfth century, when Henry II of England ordered panels of common citizens to prepare lists of suspected criminals in their communities.

Many of the earliest known images of Hindu deities in India date from the time of the Kushan empire and were fashioned either from the spotted sandstone of Mathura or from Gandharan grey schist.

另外附上prep中涉及到此知识点的两句：
Prep 1-232. (TTGWD4-Q1)
The Acoma and Hopi are probably the two oldest surviving Pueblo communities, both dating back at least a thousand years.

Prep 2-215 (GWD31-Q28)
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs have been dated at 3.47 billion years old and thus are evidence of the earliest known asteroid impact on Earth.

huangyu1648

大恩不言谢！！！！！！！！！！！！！！！！！！！！！！！！！！！！

psamelia1117

好详细！

icewaterkira

非常感谢~~

dennis2k

正好需要，感谢

蓝色大门

Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of
(E) as 40 to 44 million years old provides evidence of what was
答案是D。请问为什么到了be estimated这里楼上所说的规则就不适用了呢？期待大牛解答~

蓝色大门

补充一句，以上是OG12 SC第27题

cchen.chicago

蓝色大门 发表于 2014-2-21 00:49
补充一句，以上是OG12 SC第27题

Good job!              

anonymous1111

UP ~~~~~~~~~~~