单项选择题

If individuals (are awakened) (each time as) they begin a dream phase of sleep, they are likely to become irritable (even though) their total amount of sleep (has been) sufficient.

A．are awakened
B．each time as
C．even though
D．has been
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单项选择题
In debating, one must correct the (opponent's) facts, deny the relevance of his proof, or deny (that) (what) he presents as proof, (unless) relevant, is sufficient.
A．opponent''s
B．that
C．what
D．unless
单项选择题
It is well-known that the retired workers in our country are ____________free medical care.
A． entitled to
B． involved in
C． associated with
D． assigned to
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