单项选择题

The word "exposed" in paragraph 4 is closest in meaning to______.

A．photographed.
B．uncovered.
C．located.
D．appeared.
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单项选择题
Which of the following is NOT true of the environments in which fossils are found
A．Very different environments can favor fossilization.
B．There are few environments in which fossils are protected.
C．Environments that favor fossilization always have similar characters.
D．Environments that favor fossilization can sometimes support large populations of animals.
单项选择题
Which of tile following is LEAST likely to be found as a fossil, assuming that all are buried rapidly
A．a dinosaur.
B．a woolly mammoth.
C．a human ancestor.
D．a worm.
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