单项选择题

How long is the shaft

A．21 miles.
B．23 miles.
C．31miles.
D．33 miles.
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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
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.
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