GWD32-Q4
rock samples taken from the remains of an asteroid about twice
the size of the 6-mile –wide asteroid eradicated the dinosaurs
has been dated to be 3.47billion years old and thus is evidence
of the earliest known asteroid impact on earth
1) has been dated to be 3.47 billion years old and thus is
2) has been dated at 3.47 billion years old and thus
3) have been dated to be 3.47 billion years old and thus are
4) have been dated as being 3.47 billion years old and thus
5) have been dated at 3.47 billion years old and thus are
求答案 理由
5)
习惯用语
be dated back to time
be dated at time
agree with upstair MM
这个题目应该选3
我选 E）
因为
date to ＋一段时间
date at + 确定时间
叁考
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A.sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B.sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C.sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D.sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E.sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
if E is "have been dated at 3.47 billion years and thus are" then it is perfect since "dated at" is idiomatic, only thing I am not sure is that "old", which make "3.47 billion years old" an adj., I dont know if I saw a "at + adj." usage? is it strange?
GWD32-Q4
rock samples taken from the remains of an asteroid about twice
the size of the 6-mile –wide asteroid eradicated the dinosaurs
has been dated to be 3.47billion years old and thus is evidence
of the earliest known asteroid impact on earth
1) has been dated to be 3.47 billion years old and thus is
2) has been dated at 3.47 billion years old and thus
3) have been dated to be 3.47 billion years old and thus are
4) have been dated as being 3.47 billion years old and thus
5) have been dated at 3.47 billion years old and thus are
答案选3。看后面的old，表示samples的'年龄'已经是3.47b年；如果用5的dated at，至少old就不该要，只能说'at'在哪一年而不能说在哪一年old；如果要表达‘多少年前’这个概念，应该用before和完成时连用，相应地，at也该改为from: have been dated from 3.48 billion years before
up
我选 E）
因为
date to ＋一段时间
date at + 确定时间
叁考
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A.sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B.sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C.sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D.sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E.sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
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