天山4 Q6&Q7 百思不解, 望NN解惑

Xandria

Tianshan-4-Q5 to Tianshan-4-Q7:

Although many lines of evidence indicate

that birds evolved from ground-dwelling

theropod dinosaurs, some scientists remain

Line   unconvinced. They argue that theropods

(5)    appeared too late to have given rise to birds,

noting that Archaeopteryx lithographica—the

oldest known bird—appears in the fossil

record about 150 million years ago, whereas

the fossil remains of various nonavian

(10)   maniraptor theropods—the closest known

relatives of birds—date only to about 115

million years ago. But investigators have

now uncovered bones that evidently belong

to nonavian maniraptors dating to the time of

(15)   Archaeopteryx. In any case, failure to find

fossils of a predicted kind does not rule out

their existence in an undiscovered deposit.

Skeptics also argue that the fused clavicles

(the “wishbone”) of birds differ from the

(20)   unfused clavicles of theropods. This

objection was reasonable when only early

theropod clavicles had been discovered,

but fossilized theropod clavicles that look

just like the wishbone of Archaeopteryx

(25)   have now been unearthed. Finally, some

scientists argue that the complex lungs of

birds could not have evolved from theropod

lungs, an assertion that cannot be supported

or falsified at the moment, because no fossil

(30)   lungs are preserved in the paleontological

record.

Tianshan-4-Q6:

In the context of the passage, the phrase “fossils of a predicted kind” (line 16) most likely refers to which of the following?

A.       Theropod fossils with fused clavicles

B.       Theropod fossils that are similar in structure to Archaeopteryx fossils

C.      Theropod fossils dating back more than 150 million years

D.      Fossils indicating the structure of theropod lungs

E.       Fossils indicating the structure of Archaeopteryx lungs

Answer: C

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Tianshan-4-Q7:

Which of the following is mentioned in the passage as an argument made by scientists who are unconvinced that birds evolved from theropod dinosaurs?

A.       There are no known theropod dinosaur fossils dating from a period after the time of Archaeopteryx.

B.       There are no known theropod dinosaur fossils that indicate the structure of those dinosaurs’ lungs.

C.      Theropod dinosaurs appear in the fossil record about 150 million years ago.

D.      Theropod dinosaurs did not have fused clavicles.

E.       Theropod dinosaurs had certain bones that look just like those of Archaeopteryx.

Answer: D

第六题答案是C, 我选A, 我觉得那句话是个启下的句子, 引出来后面的内容, 因该是A吧?

第七题答案是D, 我选B, 我觉得问题里面明确了是unconvinced, fused clavicles的问题不是已经有挖出来的东西去convince可吗? 为什么不选B?

谢谢!!!

rakesun

6,那句话的主要作用不是启下，是承上，它把上面的内容总结了.所以应该是指更古老的化石.

7,划红线的句子下面那段话,明确的说出了

Skeptics also argue that the fused clavicles

(the “wishbone”) of birds differ from the

(20)   unfused clavicles of theropods.

所以很明确是选D的。

unconvinced是修饰科学家的，问题问的是这些持怀疑观点的科学家提出了什么理论？不是问他们提出了什么尚未被证实的理论。