单项选择题

The crocodile can only look（）

A．left
B．right
C．backwards
D．forwards

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单项选择题
Which pf the following used the Internet first（）

A．Hospitals.
B．Universities.
C．Banks.
D．The government.
单项选择题
How long has the Internet been used（）

A．For about 10 years.
B．For about 20 years.
C．For about 40 years.
D．For about 60 years.
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