31.What is the main idea of the passage?
(A) Human ancestors became predominantly right-handed when they began to use tools.
(B) It is difficult to interpret the significance of anthropological evidence concerning tool use.
(C) Humans and their ancestors have been predominantly right-handed for over a million years.
(D) Human ancestors were more skilled at using both hands than modern humans.
32.The word "other" in line 8 refers to
(A) outline
(B) hand
(C) wall
(D) paint
33.What does the author say about Cro-Magnon paintings of hands?
(A) Some are not very old.
(B) It is unusual to see such paintings.
(C) Many were made by children.
(D) The artists were mostly right-handed.
34.The word "implements" in line 13 is closest in meaning to
(A) tools
(B) designs
(C) examples
(D) pieces
35.When compared with implements "flaked with a counter-clockwise rotation" (line 15), it can be inferred that "implements flaked with a clock-wise motion" (line13-14) are
(A) more common
(B) larger
(C) more sophisticated
(D) older
36 The word "clues" in line 16 is closest in meaning to
(A) solutions
(B) details
(C) damage
(D) information
37 The fact that the Inuit cut meat by holding it between their teeth is significant because
(A) the relationship between handedness and scratches on fossil human teeth can be verified
(B) it emphasizes the differences between contemporary humans and their ancestors
(C) the scratch patterns produced by stone knives vary significantly from patterns produced by modern knives
(D) it demonstrates that ancient humans were not skilled at using tools
38 The word "hemispheres" in line 24 is closest in meaning to
(A) differences
(B) sides
(C) activities
(D) studies
39 Why does the author mention Homo erectus and Home habilis in line 27?
(A) To contrast them with modern humans
(B) To explain when human ancestors began to make tools
(C) To show that early humans were also predominantly right handed
(D) To prove that the population of Neanderthals was very large
40 All of the follows are mentioned as types of evidence concerning handedness EXCEPT
(A) ancient artwork
(B) asymmetrical skulls
(C) studies of tool use
(D) fossilized hand bones