单项选择题

When someone writes with ______ ink, only those people who have a special ilquid solution can bring the writing into view to discover the meaning of the message.

A．consistent
B．reflex
C．obvious
D．invisible
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Isn't it remarkable the way e-mail can ______ messages from one computer to another in a matter of seconds
A．convey
B．express
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Never ______ until tomorrow what you can do today.
A．pick out
B．make out
C．give off
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