单项选择题

Where is this article likely to be excerpted from

A．Biology textbook.
B．Scientific report.
C．Science fiction.
D．Essay.
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单项选择题
What does this information (in paragraph 7) refer to
A．Soft tissues.
B．Bone.
C．Markings.
D．Nose.
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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