单项选择题


Questions 11-13 are based on the following passage. You now have 15 seconds to read questions 11-13.
For what reason is language the greatest invention of mankind

A．Language was the first invention of mankind.
B．Man depends a lot on language.
C．Man could not have made most of his inventions if there were no language.
D．There were so many languages.
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单项选择题
The purpose of Frederick Ⅱ’ s experiment was ______ .
A．to prove that children are born with ability to speak
B．to discover what language a child would speak without hearing any human speech
C．to find out what role careful nursing would play in reaching child to speak
D．to prove that a child can be damaged without learning a language
单项选择题
What do we know about the origin of language
A．The origin of the language is reflected in sounds and letters.
B．The origin of language is handed down from generation to generation.
C．The origin of language dates back to the prehistoric period.
D．The origin of language is a problem not yet solved.
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