If the eyes are the romantic's window into the soul, then the teeth are an anthropologist's(人类学家)door to the stomach.
Peter Ungar of the University of Arkansas and his partner.Matt Sponhenner of the University of Colorado, US, examined the teeth of ancient hnman beings to find out what they were really eating, according to a.study published in the journal Science.
They already knew that different foods cause different marks on teeth.Some cause scratches, while others cause pits(坑).The carbon left on teeth by different foods is also different.Tropical(热带的)grasses, for example, leave one kind of carbon, but trees and bushes leave another kind because they photosynthesize(光合作用)differently.
Traditionally, scientists had looked at the size and shape of teeth and skulls(头骨)to figure out what early humans ate.Big flat teeth were taken to be signs that they ate nuts and seeds, while hard and sharp teeth seemed good for cutting meat and leaves.But this was proven wrong.
The best example was the Paranthropus(傍人)one of our close cousins, some of which lived in eastern Africa.Scientists used to believe that Paranthropus ale nuts, fruits and seeds because they had big crests(突起)on their skulls, suggesting that they had large chewing muscles(咀嚼肌)and big teeth.If this had been true, their teeth should have been covered with pits like the surface of the moon.They would also have had a- particular type of carbon on their teeth that typically comes from tree products, such as nuts and seeds.
However, when the two scientists studied the Paranthropus, it turned out to have none of these characteristics.The teeth had a different kind of carbon, and were covered with scratches, not pits.This suggested they probably ate grass, not nuts and fruit stones, it was the exact opposite of what people had expected to find.
Carbon "footprints" give us a completely new and different insight into what different species ate and the different environments they lived in.If a certain species had the kind of carbon on its teeth that came from grasses, it probably lived in a tropical grassland, for example.
(1)
The underlined sentence in Paragraph 1 probably means that anthropologists can ________.
[ ]
A.
study the structure of human stomachs by studying their teeth
B.
learn whether humans were healthy by looking at their teeth
C.
study the diet of early humans by studying their teeth
D.
get the most useful information about humans from their teeth
(2)
According to Paragraphs 3 to 5, which of the following statements is TRUE?
[ ]
A.
Different foods leave different marks and carbon on teeth.
B.
Early humans with hard and sharp teeth ate meat and leaves.
C.
Pits on teeth are caused by eating grass or leaves.
D.
Scratches on teeth are caused by eating nuts or seeds.
(3)
The example of the Paranthropus was mentioned in the article in order to ________.
[ ]
A.
tell readers that they are one of our dose cousins living in eastern Africa
B.
tell readers they had different eating habits from modern humans
C.
tell readers that living environment makes a difference to skull structure
D.
prove the size and shape of skulls does not show accurately what early humans ate
(4)
Which of the following shows the best organization of the article?________