[填空题]

Language, the principal means used by human beings to communicate with one another. Language is primarily spoken, although it can be transferred to other media, such as writing. If the spoken means of communication is unavailable, as may be the case among the deaf, visual means such as sign language can be used. A prominent characteristic of language is that the relation between a linguistic sign and its meaning is arbitrary.
(41) Language and Language Abilities
Language can be used to discuss a wide range of topics, a characteristic that distinguishes it from animal communication. The dances of honey bees, for example, can be used only to communicate the location of food sources.
(42) The Sounds of Language
Because most languages are primarily spoken, an important part of the overall understanding of language involves the study of the sounds of language.
Most sounds in the world’s languages--and all sounds in some langu

[填空题]

Language, the principal means used by human beings to communicate with one another. Language is primarily spoken, although it can be transferred to other media, such as writing. If the spoken means of communication is unavailable, as may be the case among the deaf, visual means such as sign language can be used. A prominent characteristic of language is that the relation between a linguistic sign and its meaning is arbitrary.
(41) Language and Language Abilities
Language can be used to discuss a wide range of topics, a characteristic that distinguishes it from animal communication. The dances of honey bees, for example, can be used only to communicate the location of food sources.
(42) The Sounds of Language
Because most languages are primarily spoken, an important part of the overall understanding of language involves the study of the sounds of language.
Most sounds in the world’s languages--and all sounds in some langu

[单项选择] Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily. Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to the success of mankind. Since 1960 a new kind of tool has appeared. This is the si
A. was one of the first tools.
B. developed human capabilities.
C. led to the invention of machines.
D. was crucial to the development of mankind.