According to Paragraph 12, which of the following can be inferred about the effect of high-tech music systems on drivers？
A. It is convenient to listen to music when drivers are driving.
B. It is one of the causes leading to traffic accidents.
C. It is not easy for drivers to change a cassette or disc.
D. It attracts the drivers" attention and takes their eyes off the road.
In Paragraph 5, why does the author mention Homo Erectus and Homo Habilis？
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.
Which of the following can be inferred about the authors opinion of the average studiers？
A. They study sufficiently but don"t work more than necessary.
B. The average studier takes his education seriously and will study with friends.
C. The line between education and having a good time is not so clear.
D. They leave college with a solid education and are much more socially adept.
What can be inferred about student
A. He tries to summarize what the professor has said.
B. He tries to express his own opinion.
C. He raises a question on the topic.
D. He becomes quite confused on the topic.
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