单项选择题

What was deposited on the bottom of the gas bottle

A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.
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单项选择题
It can be inferred from the passage that e-mailing is accessible only to those who ______.
A．investigate the invisible cyberspace
B．excel in the computer operational skills
C．subscribe to an on-line information service
D．share their thought and ideas generously
单项选择题
The virtue of e-mailing on the campus is to ______.
A．build up a personal archive
B．broaden the horizons of the students
C．facilitate rapid and easy interaction
D．see video pictures on the students' workstations
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