单项选择题

In "The major debilitating symptoms of Alzheimer’s disease include serous forgetfulness- particularly about recent events-- and confusion.", "debilitating" means______.

A．deceasing
B．declining
C．serious
D．degrading
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单项选择题
According to the passage, which of the following causes Alzheimer’s disease
A．Sever emotional stress.
B．Nutritional deficiency.
C．The death of nerve ceils in the cerebral cortex.
D．Severe head trauma.
单项选择题
______your opinions are worth considering, the committee finds it unwise to place too much importance on them.
A．As
B．Since
C．Provided
D．While
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