单项选择题

What does "this information" (in paragraph 7) refer to

A．Soft tissues.
B．Bone.
C．Markings.
D．Nose.
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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.
单项选择题
Why researchers put trees in extra carbon dioxide in the first study
A．To learn whether trees can still absorb carbon dioxide under extreme conditions.
B．To get more oxygen from these trees.
C．To evaluate the maximum carbon dioxide that trees can absorb.
D．To see the growth rate of these trees.
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