单项选择题

A．Housing costs.
B．Average wage.
C．Unemployment.
D．Oil prices.
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单项选择题
A．Human brains differ from person to person.B．The brain a person is born with is vital in determining his intelligence.C．Environment is crucial in fostering a person’s intelligence.D．Persons having identical brains are doomed to have identical intelligence.
A．Human brains differ from person to person.
B．The brain a person is born with is vital in determining his intelligence.
C．Environment is crucial in fostering a person’s intelligence.
D．Persons having identical brains are doomed to have identical intelligence.
单项选择题
Sleep defensively means that people should ______.
A．go to see a doctor when they have sleep problems
B．keep to a flexible sleep pattern
C．sacrifice other things to get enough sleep if necessary
D．follow changeable sleep routines
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