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TOEFL Readings 23
Tools and hand bones excavated from the Swartkrans cave complex in South Africa
suggest that a close relative of early humans known as Australopithecus robustus may
have made and used primitive tools long before the species became extinct 1 million
Line years ago. It may even have made and used primitive tools long before humanity's
(5) direct ancestor, Homo habilis, or “handy man,” began doing so. Homo habilis and its
successor, Homo eretus, coexisted with Australopithecus robustus on plains of
South Africa for more than a million years.
The Swartkrans cave in South Africa has been under excavation since the 1940's.
The earliest fossil-containing layers of sedimentary rock in the cave date from about
(10) 1.9 million years ago and contain extensive remains of animals, primitive tools, and
two or more species of apelike hominids. The key recent discovery involved bones
from the hand of Australopithecus robustus, the first time such bones have been found.
The most important feature of the Australopithecus robustus hand was the pollical
distal thumb tip, the last bone in the thumb. The bone had an attachment point for a
(15) “uniquely human” muscle, the flexor pollicis longus, that had previously been found
only in more recent ancestors. That muscle gave Australopithecus robustus an opposable
thumb, a feature that would allow them to grip objects, including tools. The researchers
also found primitive bone and stone implements, especially digging tools, in the same
layers of sediments.
(20) Australopithecus robustus were more heavily built ― more “robust” in anthropological terms ― than their successors. They had broad faces, heavy jaws, and massive crushing
and grinding teeth that were used for eating hard fruits, seeds, and fibrous underground
plant parts. They walked upright, which would have allowed them to carry and use tools.
Most experts had previously believed that Home habilis were able to supplant
(25) Australopithecus robustus because the former's ability to use tools gave them an innate
superiority. The discovery that Australopithecus robustus also used tools means that
researchers will have to seek other explanations for their extinction. Perhaps their
reliance on naturally occurring plants led to their downfall as the climate became drier
and cooler, or perhaps Homo habilis, with their bigger brains, were simply able to
(30) make more sophisticated tools.
16. It can be inferred from the first paragraph that all of the following
may have made and used tools EXCEPT
(A) Australopithecus robustus
(B) Home erectus
(C) Home habilis
(D) Australopithecus robustus' ancestors
17. Which of the following does the author mention as the most important
recent discovery made in the Swartkrans cave?
(A) Tools
(B) Teeth
(C) Plant fossils
(D) Hand bones
18. What does the third paragraph mainly discuss?
(A) Features of Australopithecus robustus' hand
(B) Purposes for which hominids used tools
(C) Methods used to determine the age of fossils
(D) Significant plant fossils found in layers of sediment
19. It can be inferred from the description in the last paragraph that
Australopithecus robustus was so named because of the species'
(A) ancestors
(B) thumb
(C) build
(D) diet
20. The word “supplant”in line 24 is closest in meaning to
(A) exploit
(B) displace
(C) understand
(D) imitate
21. The word “them” in line 25 refers to
(A) tools
(B) Homo habilis
(C) Australopithecus robustus
(D) experts
22. The word “innate” in line 25 is closest in meaning to
(A) inherent
(B) incidental
(C) objective
(D) irrelevant
23. What does the author suggest is unclear about Australopithecus robustus?
(A) whether they used tools
(B) what they most likely ate
(C) whether they are closely related to humans
(D) why they became extinct