单项选择题

A．The progress in developing alternative energy.
B．The abundant deposit.
C．The development of technology.
D．All of the above.
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单项选择题
The following are the founding fathers of the American Republic except ______.
A．George Washington
B．Thomas Jefferson
C．Willian Penn
D．Benjamin Franklin
单项选择题
Which of the following about language is NOT correct
A．Language is arbitrary.
B．Language is a system which consist of two levels: sounds and meaning.
C．Language is vocal.
D．Language is a fixed system and is not productive.
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