单项选择题

Through a procedure known as time-sharing, one large computer can be employed (simultaneously) by lots of small users.

A．ahead of time
B．all the time
C．at the same time
D．in time
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单项选择题
Many problems that (bothered) people then continue to exist today.
A．disturbed
B．destroyed
C．endangered
D．interested
单项选择题
It is easier to adapt to new situations if one has a (flexible) attitude.
A．changeable
B．fashionable
C．moveable
D．elastic
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