单项选择题

A．Six months.
B．Ten months.
C．Two years.
D．Five years.
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单项选择题
In his study Professor Smith asked the subjects________.
A．to keep track of people who tend to forget things
B．to report their embarrassing lapses at random
C．to analyze their awkward experiences scientifically
D．to keep a record of what they did unintentionally
单项选择题
More people are killed by huge sea waves than by buildings falling.
A．Y
B．N
C．NG
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