单项选择题

The word "passage" (Line 2, Para. 8) means ______.

A．gate
B．channel
C．cross
D．paragraph
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单项选择题
One advantage with Nostrils high on the head is to ______.
A．use sense of smell more efficiently
B．help them move fast and alert
C．enable them to find more food
D．help them live under water more easily
单项选择题
Which of the following may not be a reason why Professor Witmer studies crocodiles and lizards in his experiments
A．They are close relatives to dinosaurs.
B．Their soft tissues survive as fossil remains.
C．Their soft tissues have similar traits with dinosaurs.
D．He cannot find living dinosaurs.
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