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【单选题】
For a monopoly, marginal revenue is less than price becauseA.
the demand for the firm's output is perfectly elastic
B.
the firm has no supply curve.
C.
the demand for the firm's output is downward sloping.
D.
the firm can sell all of its output at any price.
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【单选题】Mary is a humorous and warm-hearted woman and that is she is a most popular person in her community．
A.
why
B.
because
C.
how
D.
whether
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【单选题】A person being treated for shock should be wrapped in warm coverings to ______.
A.
increase body heat
B.
preserve body heat
C.
avoid self-inflicted wounds caused by spastic movement
D.
protect the person from injury during transportation
【简答题】He was a warm-hearted person and always offered h______ to his friends.
【单选题】Mary is a humorous and warmhearted woman and that is ________ she is a most popular person in her community.
A.
whether
B.
because
C.
how
D.
why
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