单项选择题

A．Voice and text chat across the internet.
B．Mobile messaging.
C．The advantages of internet.
D．The disadvantages of text chat.
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单项选择题
A．From his friend.B．From the theater.C．From a charity organization.D．From an unknown source.
A．From his friend.
B．From the theater.
C．From a charity organization.
D．From an unknown source.
单项选择题
A．Agricultural robots.B．Industrial robots.C．Computers.D．Electrical robots.
A．Agricultural robots.
B．Industrial robots.
C．Computers.
D．Electrical robots.
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