单项选择题

The Golden Gate Bridge is

A．8450 feet long
B．more than 8450 feet with approaches excluded
C．more than 8450 feet with approaches included
D．8450 feet long with approaches included
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单项选择题
What can we infer from the passage
A．Human's future could be depended on advance in medical science.
B．We could introduce certain kind of disease to control the number of some species.
C．Human could control diseases.
D．Introduction of the myxomatosis could control rabbit population in the world.
单项选择题
Why did the introduction of myxomatosis into New Zealand as a means of rabbit control fail
A．Because the nature of myxomatosis is evil.
B．Because the species of flea and mosquito that transmit the disease are absent in this country.
C．Because there are too many rabbits.
D．Because the myxomatosis virus bas drastically reduced.
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