单项选择题

Some researchers feel that certain people have nervous systems particularly _______ to hot, dry winds. They are what we call weather-sensitive people.

A．subjective
B．subordinate
C．liable
D．vulnerable
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单项选择题
Diamonds have little _______ value and their price depends almost entirely on their scarcity.
A．intrinsic
B．eternal
C．subtle
D．inherent
单项选择题
Malnutrition may well be _______his ill health.
A．the reason of
B．due to
C．the cause of
D．owing to
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