C. the back legs of limbed animals evolved after the transition to living on land
D. tetrapods had a "four-wheel drive" form of movement before they evolved
64. Scientists think the findings of Tiktaalik are significant because_.
A. Tiktaalik is the earliest fish living on the earth
B. Tiktaalik fills a gap between fish and limbed animals
C. Tiktaalik is the only closest known relative of limbed animals
D. Tiktaalik gives them a chance to compare the front and back limbs
65.Why didn't the researchers examine the fossils of the back part of Tiktaalik many years ago?
A. Because the blocks contained too much bone of Tiktaalik.
B .Because Tiktaalik is not the ancestor of all limbed animals.
C. Because the research of fossils is a slow and time-consuming process.
D. Because the fossils were discovered in northern Canada's Ellesmere Island.
66. What does the underlined word "diminutive" in Paragraph 8 mean?
A. Unique. B. Complete. C. Flexible. D. Small.
【参考答案】 63—65、CBC
66、D
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