单项选择题

A. Australian and American.
B. Guest and host.
C. Husband and wife.
D. Professor and student.
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单项选择题
The time of the recognition span can be affected by the following facts EXCEPT ______.
A. one’s familiarity with the text
B. one’s purpose in reading
C. the length of a group of words
D. lighting and tiredness
单项选择题
According to the report, ______.
A. many short sleepers need less sleep by nature
B. many short sleepers are obliged to reduce their nightly sleep time because they are busy with their work
C. long sleepers sleep a longer period of time during the day
D. many long sleepers preserve their sleeping habit formed during their childhood
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