问答题

In 2012, Dr. Schwaitzers discovery of the same protein in dinosaurs and modern birds could possibly prove
A．dinosaurs might be the probable ancestors of modern birds.
B．soft-tissue material could have come from modern bacteria.
C．fossils should be protected from bacterial contamination.
D．organic molecules of dinosaurs could survive in fossils.

A.dinosaurs
B.
B．soft-tissue
C.
C．fossils
D.
D．organic
E.

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The authors attitude toward Dr. Schweitzer and Dr. Goodwins speculation on the possibility of DNA preservation is

A.skeptical.
B．supportive.
C．indifferent.
D．optimistic.