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Why is the mixed planting of trees of the same species advocated in modern orchards and forests

A．Because mixed forests and orchards are the recognized procedures these days.
B．Because trees of same species may spread disease.
C．Because orchards and forests are modern.
D．Because trees planted crowdedly do not have enough room to develop their roots.

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.